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PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 87 



total length, 8 mm.; the cockscomblike middle lobe (5.2 mm.) longer 

 than the other two; cephalogastric lobes are spherical, 2.7 mm. in 

 diameter; maxillipeds very small and inconspicuous. The thorax 

 shows a pair of low prominences for the anterior oostegites (p) and 

 the last two appear as paired conical papillae (rv^, v). The anterior 

 portion of the abdomen is covered by loose, wrinkled, fluffy pleura 

 {pi) and exopods (ex) ; behind these three well-defined segments with 

 rounded lateral expansions connect with a small rounded terminal 

 segment. Length of cephalothorax, without frontal lobes, 9.5 mm.; 

 length of abdomen, 7 mm. 



Male. — Body rather plump, tapered from middle posteriorly; 

 length 1.4 mm. Head rounded (fig. 3, B), not angulate, about twice 

 as wide as long; with two large, round eyespots near posterolateral 

 borders. Terminal segment of abdomen (fig. 13, 0) bifid at tip, 

 with rami blunt and rounded. 



Figure 13. — Cancrion needleri, new species : A, Dorsal view of male ; B, dorsal view of 

 head of male; C, lateral and dorsal views of posterior end of male; D, female (eg, 

 cephalogaster ; ex, exopods of second and third abdominal segments ; p, oostegites 

 i-in ; pi, pleural lamellae of first abdominal segment). 



Types. — Female holotype and male allotype, U.S.N.M. No. 77216, 

 from Neopaiwpe texana (Smith), Ellerslie, Prince Edward Island, 

 August 4, 1938, A. S. Pearse, collector. 



The two entoniscids described belong in the genus Cancrion as 

 defined by Giard and Bonnier (1887), on account of the character 

 of the epicarid larva (p. 228) and adults (p. 239). They differ as 

 follows from the three species previously described: In females the 

 anterior oostegites have fewer and less prominent lobes, the abdom- 

 inal segments are more clearly defined, the branchial pleural lamellae 

 are confined to the first three abdominal segments, and the cardiac 

 prominences are low; in males groups of denticles are absent from 

 the abdominal segments and thoracic legs, the head is short and 

 broad, and the thoracic pleural lamellae are narrow. They more 

 closely resemble each other than the three species described by Giard 

 and Bonnier from crabs of the genera Xantho and Pilumnus along 

 the coast of France. 



