718 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxi. 



Total length, 3 mm.; length of carapace. 0.85 mm.; of free thorax, 

 1.1 mm. ; of genital segment, 0.71 mm. ; of abdomen, 0.34 mm. ; of egg- 

 strings, 2.35 mm.; width of carapace, 1.75 mm. 



Male. — Similar to the female in general appearance and in most of 

 the details of structure. Genital segment elongate spindle-shaped, one- 

 third longer than wide, with evenly rounded sides; anterior margin 

 reentrant, posterior one nearh' squarel}" truncated. 



Both the fifth and sixth legs visible, the former on the lateral mar- 

 gins, the latter at the posterior corners. Abdomen not as wide as in 

 the female, and the anal lamina^ a little smaller. 



Second antennae especiall}" large and stout, the terminal claw bear- 

 ing on its inner margin a long curved spine, a short blunt one, and a 

 long slender hair. Second maxilh^ larger and more powerful than in 

 the female, the outer branch at the tip nearly twice as long as the 

 inner one. Spines on the ventral surface of the genital segment larger 

 and more numerous than in the female. 



Total length, 3 mm. Length of carapace, 0.8 mm.; of free seg- 

 ments, 1.08 nmi.; of genital segment, 0.8 mm.; width of carapace, 

 1.9 mm. 



Color of the two sexes (preserved material) the same, a uniform 

 yellowish white without pigment. 



{xpinlfer, sphia, a spine; and yero, I bear). 



Through the courtesy of Prof. W. A. Herdman, of the University 

 of Liverpool, the collection of the United States National Museum 

 contains a specimen of each sex of this new genus, Cat. No. 32729, 

 U.S.N.M. 



BIBLIOGRAPHY. 



The following are the papers referred to in the text: 



1838. Kroyer, H. Om Snyltekrebsene, isaer med Hensyn til Danske Fauna. 



Naturhistorisk Tidsskrift, pp. 7 and 131, pis. i-iii. 

 1840. Milne-Edwards, H. Histoire Naturelie des Crustaces, Paris, III, pp. 



432-529. 

 1850. Baird, W. The Natural History of the British Entomostraca. Printed for 



the Ray Society, London. 

 1861. Steenstrup, J., and Lutken, C. Bidrag til Kundskab om det aabne Havs 



Snyltekrebs og Lerneer. Kongelige Danske Videnskabernes Selskabs 



Skrifter, 5te Raekke naturhistorisk og niatheinatisk Afdeling, V, pp. 343- 



432, pis. i-xiv. 

 1863. Kroyer, H. Bidrag til Kundskab om Snyltekrebsene. Naturhistorisk 



Tidsskrift, Tredie Raekke, Andet Bind, pp. 75-426. 

 1869. Olsson, p. Prodromus faunae Copepodorum parasitantium Scandinaviae. 



Karolinska universitet, Lund, Arsskrift, 1868, pp. 1-36. 

 1887. Rathbun, R. Descriptions of new Species of parasitic Copepods, belonging to 



the Genera Trebius, Perissopus, and Lernanthropus. Proceedings of the 



United States National Museum, X, pp. 559-571, pis. xxix-xxxv. 



