566 ORDER ABDOM1NAJ.IA. 



why the position of Cryptophialus in the system should 

 not be determined by the male, instead of by the fe- 

 male, the answer would be that the male is here abnormal 

 and rudimentary in its whole structure; and T believe 

 systematists are agreed that less perfect parts (and there- 

 fore a less perfect whole) offer less valuable characters 

 than the more perfect parts or whole. We see this con- 

 clusion plainly verified in the case of the hermaphrodite 

 Scalpellum vidgare and Ibla quadrivalvis, for there can be 

 no doubt where these species should be arranged, yet if we 

 attempted to place them by their complemental males, we 

 should utterly fail : exactly in the same manner, if Ibla 

 Cumingii and Scalpelhim ornatum were ranked by their males, 

 they would be quite misplaced. So again, if we were to 

 attempt to class the six species of Scalpellum by their males 

 and complemental males, undoubtedly the first three and last 

 three species of the genus would have to stand in distinct 

 orders ! Hence we may reject the males as a foundation for 

 classification, but no doubt they serve to show that the re- 

 semblances in the carapaces of Alcippe and Cryptophialus, 

 are not merely analogical or functional, but evince a true 

 affinity, though these genera differ so greatly, in mouth, 

 body, oesophagus, cirri, and especially in their metamor- 

 phoses. 



Cryptophialus minutus. PI. 23, 24, tig. I to 19. 



ilafj. — Chonos Archipelago, Southern Chile; imbedded in the Concholepas 

 Peruviana. 



FEMALE. Fig. 1 18. 



General Appearance.* — This, the smallest known cirri- 

 pede, is flask-shaped and compressed, with a small orifice, 

 on a more or less produced neck, placed at one corner : one 

 of the narrow sides of this carapace is somewhat flattened or 



* I am greatly indebted to Dr. Hooker, for having several vears aco, when 

 examined tins my first cirripede, aided me in many ways, and shown me how 

 lo dissect the more difficult parts, and for having made for me several very 

 correcl drawings, which, with some subsequent alterations, are now engraved. 



