KO. 1876. ON THE! CRUSTACEAN ORDER CU2IACEA— CAIMAN. 



631 



ffVt^ 



ing a single lateral ridge on the carapace it resembles H. uniplicata 

 G. O. Sars, but it is distinguished by the antennal notch, the much 

 shorter first legs, and the different proportions of the uropods. 

 Xoca?%.—Bermg Island ; N.Grebnitzky; U.S.N.M. 13678; 1 female. 



PARALAMPROPS ORBICULARIS (Caiman). 



Platyaspis orbicularis Calman, Fisheries, Ireland, Sci. Invest., 1904, No. 1 (1905), 



p. 43, pi. 5, figs. 77-81. 



Immature female (with developing oostegites). — Total length, 16 

 mm. A less perfect ovigerous female is about the same size. 



Carapace, viewed from above, roughh^ square in outline, with 

 broadly rounded corners, the lateral margins very slightly convergent 

 anteriorly; the anterior margin is concave, with 

 a slight pseudorostral projection in the middle. 

 The greatest transverse wddth is a little less than 

 the length measured in the middle line. On the 

 dorsal surface a median serrated ridge, or rather 

 a row of minute teeth, runs backward from the 

 small ocular lobe to a little past the middle 



of the length of the 

 carapace; there are no 

 paired ridges on the 

 posterior part of the 

 dorsal surface. The 

 under surface of each 

 wing of the carapace is 

 divided into two by 

 a somewhat sinuous 

 longitudinal ridge. 



The first leg-bearing 

 somite is larger than 

 those that follow it, 

 but its pleural plates 

 are completely over- 

 lapped by those of the 

 second somite. The 

 last thoracic somite is 

 similar to, but shorter 

 than, the first abdom- 



FlGS. 29-30.— PARAL.\MPR0PS ORBICXn..\rjS, IMlIAXaRE FEMALE. 

 FROM above; 30, ANTERIOR PART OF BODY FROM BELOW. 



29, 



inal somite. 



The abdomen, including the telson, is about If times as long as the 

 cephalothoracic region, and is very slender; the fifth somite is more 

 than four times as long as wide and twice as long as the last somite. 

 The telson is a little longer than the last somite; not much narrowed 



