428 CRUSTACEA ENTOMOSTRACA. 



represent the 4th, 5th and 6th thoracic appendages (the 2nd and 3rd being 

 absent). The dwarf males (Fig. 275, a) are without alimentary canal 

 and hence are short-lived, and have a long probosciform penis. Several 

 may be found in the neighbourhood of the upper part of the disc. Alcippe 

 Hanc. A. lampas. 



Fam. 2. Lithoglyptidae. 3 spp. of the single genus Lithoglyptes Aur. 

 have been described by Aurivillius, living in burrows which they excavate in 

 coral or in the shells of molluscs. There are 5 pairs of thoracic appendages 

 the 2nd only being absent, and 3-4 jointed caudal appendages. The 

 plane of the disc of attachment is nearly at right angles to that of the 

 orifice of the burrow. Alimentary canal complete. E. Indies. 



Fam. 3. Cryptophialidae. Three pairs of biramous cirriform feet at 

 the posterior end of the body. Cryptophialus Darw., C. minutus Darw. 

 The female attached by a disc, as in Alcippe, in the shell of the gasteropod 

 Concholepas peruviana ; W. coast of S. America. There appear to be 

 10 post-cephalic segments of the body. The anterior thoracic appendages 

 rudimentary. Alimentary canal complete. The dwarf males resemble 

 those of Alcippe. 



Fam. 4. Kochlorinidae, contains the single genus Kochlorine Noll., 

 K. hamata Noll.* in the shells of Haliotis and other molluscs, at Cadiz. 

 Female attached to the edge of its burrow by hooks only. The body not 

 definitely segmented ; anterior thoracic appendages large and palpiform, 

 as in Alcippe. Behind the large cirriform feet is a pair of jointed caudal 

 appendages. Males not certainly known. 



Sub-order 3. APODA. 



With the characters of the family. 



Fam. Proteolepadidae. Proteolepas bivincta Darwin, the sole representa- 

 tive of this sub-order is a small maggot-like animal about >,th of an inch long, 

 which lives attached by its antennae in the mantle cavity of the pedunculate 

 cirripede Alepas cornutus. The antennae have the characteristic Cirripede 

 shape, but the mantle and all appendages, except those of the mouth, are 

 absent, and the body is divided, by constrictions, into 1 1 rings, which how- 

 ever, in view of the facts that the mouth, with its 3 pairs of appendages, 

 is borne on the first body ring, and the antennae on the second, cannot be 

 regarded as representing primary segments. It is hermaphrodite and the 

 body is mainly occupied by the largely developed ovaries. The mouth 

 is suctorial and the alimentary canal ends blindly. St. Vincent, W. Indies. 



Sub-order 4. RHIZOCEPHALA. f 



The Rhizocephala are parasites on Malacostracan, and 

 mainly on Decapod Crustacea. In the adult state they con- 



* Noll. F. C., Kochlorine hamata N. ein bohrendes Cirriped. Zeits. f. 

 Wiss. Zool., Bd. 25 (1874-5), p. 114. 



f W. Lilljeborg, Les genres Liriope et Peltogaster, Nova Acta. reg. soc. 

 scient., Upsala, Ser. 3, vol. hi., 1860. Fr. Miiller, Die Rhizocephaliden, 

 Arch, fiir Naturgesch., 1862 and 1863. R. Kossmann, Beitrage zur 

 Anatomie der schmarotzenden Raiikeiifiissler, Verhandl. der med.-phys. 

 Oesellsch. Wiirzburq, Neue Folge, Tom. IV. Yves Delage, Evolution 

 de la Sacculine, Arch, de Zool. Exp., 2 Ser., Tom. II., 1884. Smith, G., 

 Rhizocephala, Fauna u. Flora d. dol/es von NeapeL, Monog. 29 (190(>). 



