424 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



are designated paratypes. This includes material from stations 249-34, 

 478-35, 457-35, and 959-39. 



Color in life: Carapace vinaceous purple. Legs purplish gray, lighter 

 towards dactyls. Ventral side dull purple gray. Eggs scarlet red. (Peter- 

 sen, of a female from Taboga Island, Panama) 



Habitat: Of the 13 stations for which bottom data are available for 

 the species, Hemus finneganae was recovered 5 times from rock, 3 times 

 from sand, once from mud, and 4 times from organic (coral, coralline, 

 and nullipore) bottom. Shell was present with both the rock and the 

 sand. 



Depth: Shore to 32 fathoms. 



Size and sex: Male specimens range from 4.0 to 6.7 mm (the holo- 

 type), females from 4.5 to 10.0 mm, ovigerous females from 5.7 to 8.0 

 mm. The largest specimens are not from the Gulf of California, as is 

 usually the case, but were obtained at Bahia Honda, Panama, station 

 959-39. 



Breeding: Ovigerous females were encountered by the Velero III at 

 Clarion Island, Mexico, in January, in Costa Rica and Ecuador in 

 February, and in Panama in May. 



Remarks: A critical reexamination of the Hancock series of Hemus 

 revealed two Pacific species: the one, which is the true H. analogus 

 Rathbun, apparently restricted in range to the peninsular side of the 

 Gulf of California, and Tenacatita Bay, Mexico, the other, here pro- 

 posed as a new species, ranging widely from northern Mexico to Ecuador, 

 but most abundant in the Bay of Panama. Out of purely geographical 

 considerations the latter species, rather than the former, would appear to 

 be the strict analogue of the Atlantic H. cristulipes A. Milne Edwards ; 

 but fortunately this relationship is supported by morphological resem- 

 blance, as indicated by further refinement in key and diagnostic charac- 

 ters over those given by Rathbun for separating H. analogus from H. 

 cristulipes. 



The proposed new species appears to surpass either of its congeners 

 in elaborateness, the lamellate projections of the meral segments of the 

 ambulatory legs being strongly crenulate and denticulate, as shown by 

 the accompanying illustration (PI. X, fig. 1). Other valid distinctions 

 are apparent in the three lateral projections of Hemus finneganae as 

 against two in H. cristulipes, and the prolongation and arching of the 

 merus of the third maxilliped in the new species. The male first pleopod 

 of H. finneganae has a double lateral flange as distinguished from the 

 simple pleopod of H. analogus) the pleopod of H. cristulipes differs 

 radically from either. 



