SHRIMPS FROM THE MARSHALL ISLANDS CHACE 13 



The carapace of the holotype measures 2.0 mm. in length, and the 

 entire animal is approximately 8.5 mm. long. The carapace lengths 

 of the paratopes var^^ from 1.7 to 2.0 mm. 



This species is probably closely related to Processa coutieri Nobili, 

 the only other species of the genus with the carpus of the second legs 

 6-jointed. It differs from Nobili's descriptions and figures (Nobili, 

 1904, p. 234; 1906, p. 78, pi. 4, figs. 3, 3a) in having the rostrum shorter 

 rather than longer than the eyes; in having the first antennular segment 

 much longer rather than shorter than the two following segments; and 

 in having the telson armed distally with three pairs of spines (the 

 median pair plumose) rather than two pairs of spines and some long 

 plumose hairs. It is very possible that Nobili's description is in error 

 as far as the last two characters are concerned, but the difference in 

 rostral length is so great that it seems advisable to keep the two forms 

 distinct at least until the type of P. coutieri can be reexamined. 



Family Thalassocaridae 



Thalassocaris crinita (Dana) 



Figure 6 



Regulas crinitus Dana, 1852, p. 599; 1855, pi. 39, figs. 6a-h. 



Thalassocaris crinita do Man, 1920, p. 95, pi. 9, figs. 22-22o. — Armstrong, 1941, 

 p. 5. 



Bikini Atoll: Eastern end of lagoon; 30-33 fathoms, coral bottom; 

 Mar. 29, 1946; L. P. Schultz; 1 male, 5 females (3 ovigerous). 



Rongelap Atoll: Lagoon; 23 fathoms; June 16, 1946; M. W. Johnson; 

 2 ovigerous females. 



The single male in this collection has a carapace length of 5.1 mm. 

 This measurement in the females varies from 3.0 to 5.4 mm., ovigerous 

 specimens having the carapace from 4.1 to 5.4 mm. long. 



Family Alpheidae 



Automate johnsoni, new species 



Figure 7 



Bikini Atoll: May 1946; M. W. Johnson; 1 male holotype (USNM 

 94746). — Bokonfuaaku Island; intertidal in potholes; May 16, 1946; 

 M. W. Johnson; 1 ovigerous female paratype. — Enirik Island; inter- 

 tidal; 1946; M. W. Johnson; 1 juvenile. 



I Eniwetok Atoll: Bogombogo Island; intertidal; May 31, 1946; M. 

 W. Johnson; 1 male paratype. 



Rostrum (fig, 7,a) triangular and prominent, but not reaching as 

 far forward as anterior margin of carapace; no lateral grooves on 



