30 ALLAN HANCOCK ATLANTIC EXPEDITION REPORT 



Bay, Rhode Island, larvae of several types of crabs are carried by the 

 Gulf Stream to New England from more southern latitudes, although 

 few species can survive the winters farther north. 



MINYOCERUS Stimpson, 1858 

 Minyocerus angustus (Dana) 



Porcellana angusta Dana, 1852, p. 423; 1855, pi. 26, figs. 12a-c (type 



locality, Rio de Janeiro, Brazil). 

 Minyocerus angustus Stimpson, 1858, p. 229. Smith, 1869, p. 38, Rath- 

 bun, 1900, p. 149. Moreira, 1901, p. 32. 

 Porcellina stcUicola Miiller, 1862, p. 194, pi. 7, figs. 1-5 (type locality, 

 Desterro [Florianopolis], Brazil) ; 1863, p. 47, pi. 1, figs. 1-5. 

 Minyocerus augustus Moreira, 1901, p. 91. 



IPorcellana rosamondae Boone, 1930, p. 79, pi. 21 (type locality, Bahia 

 Limon, Panama). 



Previous records. — 

 ? Panama, Bahia Limon: Ara (Boone). Brazil, Rio de Janeiro: U. S. 

 Expl. Exped. (Dana); Rio Parahyba: A. W. Greeley (Rathbun) ; 

 State of Santa Catharina: (Moreira) ; Desterro [Florianopolis] : 

 (Miiller). 



Material examined. — 

 A29-39. Isla Cubagua, Venezuela; Apr 15, 1939; 2 fms. 2cf, 8? (7 

 ov). Commensal on sea stars, Luidia clathrata (Say). 



Measurements. — Males, 4.1 and 4.9 mm; non-ovigerous female, 

 4.9 mm; ovigerous females, 4.0 to 5.1 mm. 



Re?narks. — These specimens agree in every way with Dana's descrip- 

 tion and also with Rathbun's specimen from Rio Parahyba, Brazil, with 

 which they were compared. Only a faint trace remains of the color 

 pattern described by Rathbun and shown in Miiller's illustration of an 

 adult. 



Miiller (1862, 1863) stated that these crabs live parasitically on 

 some species of sea stars. This relationship, which should be termed 

 commensal rather than parasitic, is noted for the second time with the 

 recovery of the Velero III material from Luidia clathrata (Say). A 

 similar situation was reported by Glassell (1938), who described 

 Minyocerus kirki from Baja California, Mexico, commensal on Luidia 

 Columbia (Gray). 



Porcellana rosamondae Boone is tentatively placed here, since its 

 description and figure agree in most respects with Minyocerus angustus. 

 The only important differences are that in P. rosamondae the posterior 



