Upon the ventral surface of the ejaculatory duct lies an accessory gland of unknown function; it is “composed of dichotomous, monilated tubes, lined by a columnar epithelium, all bound together by a common investment into a flattened, elongated mass.”[171] The duct of this gland does not enter the penis, as described by Brehm, but opens upon a double hook, which forms part of the external genital armature (fig. [99], 3). It may be convenient to distinguish this as the “conglobate gland.”[172]

Fig. 101.—Vesiculæ Seminales and Duct­us Ejacu­lator­ius of Pupa. VD, vas de­fer­ens. × 28.

Fig. 102.—External Male Organs, sep­arat­ed. The letter­ing agrees with Brehm’s fig­ures. A, titil­lator; B, penis; C-F, hooks and plates. × 8.

The external reproductive organs of the male Cockroach are concealed within the 9th sternum. The so-called penis (fig. 102) is long, slender, and dilated at the end. It is not perforated, and we do not understand its use, though it probably conveys the semen.