112 U.S. NATIONAL MUSEUM BULLETIN 278 



are not as important in my opinion as the other characters mentioned 

 above, which Caprogammarus shares with the Caprellidea. 



For these reasons, I am placing Caprogammarus in the family 

 Caprellidae. It might be argued that since the genera Neoxenodice- 

 Caprogammarus-Cercops form a fairly even gradation between the 

 Gammaridea and the Caprellidea that merging of the suborders 

 would be justified. To do this, however, one would have to take into 

 consideration splitting the family Caprellidae into several families to 

 place it on the same level as gammaridean families. This probably 

 could be done be restricting the family Caprellidae to those forms 

 which have quite reduced abdomens and by using the family Ca- 

 progammaridae for those transitional forms such as Caprogammarus 

 and Cercops. In my opinion the Caprellidae are too poorly known to 

 make such a revision at this time and consideration should be given 

 to details of the mouthparts of members of all the genera involved 

 prior to a reorganization of famihal taxa. 



Literature Cited 



Abildgaard, p. C. 



1788. In O. F. Miiller, Zoologia Danica, seu auimalim Daniae et Norvegiae 



rariorum ac minus i otorum descriptiones et historia. Havniae, 

 vol. 2, pp. 1-56, pis. 41-80 [Caprellidae, pp. 20-22, pi. 56]. 



1789. In op. cit., vol. 3, pp. 1-71, pis. 81-120 [Caprellidae, pp. 33-34, 58, 



pi. 101, figs. 1-2, pi. 114, figs. 11-12]. 

 Allee, W. C. 



1922. Studies in marine ecology: II. An annotated catalog of the distri- 



bution of common invertebrates of the Woods Hole littoral. 

 Marine Biol. Lab. Woods Hole and Univ. Chicago [manuscript], 

 101 pp. [Caprellidae, pp. 57, 58]. 



1923. Studies in marine ecology: III. Some physical factors related to the 



distribution of littoral invertebrates. Biol. Bull., vol. 44, no. 5, 



pp. 205-253 [CaprelHdae, p. 213]. 

 AiLEN, E. J., and Todd, R. A. 



1900. The fauna of the Salcombe Estuary. Journ. Marine Biol. Assoc. 



United Kingdom, new ser., vol. 6, no. 2, pp. 151-217 [Caprellidae, 



pp. 166, 174, 178, 181, 203]. 

 Arimoto, I. 



1930. Studies on the Caprellidae of Tateyama II [in Japanese]. Journ. 



Tokyo Nat. Hist. Soc, vol. 28, no. 39, pp. 45-56, pi. 2. 



1931. Studies on the Caprellidae from Tateyama III [in Japanese]. Op. 



cit., vol. 29, no. 41, pp. 10-19, figs. 7-9, pi. 3. 

 1934. Caprellids collected by the surveying ship of the Imperial Fisheries 

 Experimental Station of the Department of Agriculture Soyo-maru 

 [in Japanese]. DebutsugaKu Zasshi [Zool. Soc. Japan], vol. 46, 

 no. 553, pp. 494-509, 1 fig., pis. 1-3. 

 Barnard, K. H. 



1916. Contributions to the crustacean fauna of South Africa. No. 5, The 

 Amphipoda. Ann. South African Mus., vol. 15, pt. 3, pp. 105-302, 

 pis. 26-28 [Caprellidae, pp. 279-285, pi. 28]. 



