N0.1222. ISOPODS OF THE ATLANTIC COAST— RICHARDSON. 573 



a'. Surface of body slightly granulated, with side parts of thoracic segments (two to 

 seven) and abdominal segments bent downward. Caudal segment with blunt 

 rounded apex. Inner branch of uropoda reaching two-thirds length of caudal 

 segment 171. MesarmadiUo rcflexus Dollfus. 



169. MESARMADILLO MODESTUS Dollfus. 



MesarmadiUo modcstus Dollfus, Proc. Zool. Soc. Lond., 189G, p. 397. 

 Habitat. — St. Vincent, West Indies. 



170. MESARMADILLO AMERICANUS Dollfus. 

 MesarmadiUo americanus Dollfus, Proc. Zool. Soc. Lond., 1896, i)p. 397, 398. 

 Habitat. — St. Vincent, West Indies. 



171. MESARMADILLO REFLEXUS Dollfus. 

 MesarmadiUo reflexus Dollfus, Proc. Zool. Soc. Lond. , 1896, pp. 398, 399. 

 Habitat. — St. Vincent, West Indies. 



71. SPH^^RONISCUS Gerstacker. 

 172. SPH^RONISCUS PORTORICENSIS, new species. 



Body oblong, very convex, contractile into a ball. Surface per- 

 fectly smooth. Head set in tirst thoracic segment; front straight; 

 epistoma forming a triangular shield. Ej-es very 

 small. Autennaj with llagellum containing three 

 joints. 



First thoracic segment twice as long as head, and 

 longer than any of the other segments. Coxopo- 

 dites not distinct from segment. 



First two abdominal segments with the lateral 

 parts concealed. The three following ones continu- 

 ing the outline of the body. The terminal segment 

 is twice as broad as long, very short, widely 

 rounded posteriorh^ The basal joints of the uro- 

 poda are large, square, extending the greater part 

 of their length beyond the terminal segment. The ^j^ 34._sphj2eoniscus 

 external branch is inserted at the inner post-lateral portoricensis, a. ab- 



k^,, 1 i''j. J ijj J domen; 6. Uropoda 



of the basal ]omt and extends downward. (inside) 



The internal branch extends much beyond the last 



abdominal segment, is longer than the l^asal joint of the uropoda, and 



reaches the tip of the external branch. 



Color reddish-brown with markings of yellow. 



Four specimens were taken by Dr. C. W. Richmond at El Yiui(|ue, 

 Porto Rico, at an altitude of 2,800 feet. 



Ti/pe.— Cut. No. 239U, U.S.N.M. 



72. HAPLARMADILLO Dollfus. 

 173. HAPLARMADILLO MONOCELLATUS Dollfus. 

 Hajildrniddillu inonocdlaiux Dollfus, I'roc. Zool. Soc. Lond. ,1896, }>. 400. 

 Hahltat. — Richmond Valley, St. Vincent, West Indies. 



