On the Origin and Metamorphoses of Insects

by Sir John Lubbock

38. Larva of Prawn, more advanced, Zoëa stage.

39. Larva of Echino-cidaris œquituberculata seen from above ✕ 6/10.

40. Larva of Echinus ✕ 100.—A, front arm; F, arms of the mouth-process; B, posterior side arm; E¹, accessory arm of the mouth-process; a, mouth; a¹, œsophagus; b, stomach; b¹, intestine; o, posterior orifice; d, ciliated bands; f, ciliated epaulets; c, disc of future Echinus.

41. Comatula rosacea.

42. Larva of Comatula rosacea.

43. Larva of Comatula rosacea, more advanced.

44. Larva of Comatula rosacea, in the Pentacrinus state.

45. Larva of Starfish (Bipinnaria), ✕ 100.

46. Larva of Starfish (Bipinnaria), ✕ 100, seen from the side.—a, mouth; b, œsophagus; c, stomach; c¹, intestine.

47. Larva of another Bipinnaria, showing the commencement of the Starfish.—g, canal of the ciliated sac; i, rudiments of tentacles; d, ciliated band.