502 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



Type locality. — Off Lower California; 58 and 71 fms. 



Type.—\]^NM No. 17485. 



Range. — From northwest of Cedros Island, Lower California (Alba- 

 tross), to Ecuador (Albatross), including the Gulf of California; 52-71 

 fms. (Albatross). 



Diagnosis. — Carapace one and one-half times as wide as long. Four 

 anterolateral teeth, excluding exorbital. First ambulatory leg short, not 

 overreaching merus of second in male. 



Material examined (124 specimens from a single station). — 

 143-34. Wenman Island, 100-150 fms, Jan. 11, 1934, 56 males, 65 

 females (including the photographed pair), 3 young. 



Measurernents. — Largest specimen, male: length 7.7 mm, width 12.3 

 mm, length of second ambulatory leg 22.5 mm; largest female; length 

 8.2 mm, width 11.7 mm, length of second ambulatoiy leg 22.8 mm. Note 

 difference of proportions in the two sexes. 



Habitat. — Bottom of coral, nullipores, and calcareous worm tubes. 



Depth.— 52-150 fms. 



Remarks. — Specimens from Wenman Island were compared with the 

 type of C. zacae Glassell in the laboratories of the New York Zoological 

 Society by Miss Jocelyn Crane, who found them to agree very nicely. 

 Specimens from Wenman Island were also compared with the type of 

 C. fragilis Rathbun at the U.S. National Museum, and were found to be 

 the same. Evidence pointing to the synonymy of C. zacae, which was said 

 by Glassell (1936) to differ from C. fragilis in having 5 anterolateral 

 spines instead of 4, in having the first leg extending past the merus of the 

 second instead of falling short of it, in having the suborbital lobe truncate, 

 instead of bilobed, and not equally advanced with the pterygostomian 

 lobe, is as follows : 



1. The inferior orbital lobe is truncate in the type specimen of C. 

 fragilis, although bilobed on the photographed specimen (USNM No. 

 20620) from Ecuador. 



2. The inferior orbital lobe makes an oblique line with the ptery- 

 gostomian lobe, which is much more advanced on an anterior-posterior 

 line. Wenman Island specimens and the type of C. fragilis are alike in 

 this respect. 



3. Both Wenman Island specimens and the type specimen of C. 

 fragilis have 4 teeth if the exorbital tooth and the posterior marginal fold, 

 which resembles a tooth, be excluded. 



4. The first ambulatory leg is detached from the carapace of the type 

 of C. fragilis and the other legs are rigid, making it impossible to tell 

 whether or not the type had the first ambulatory leg overreaching the 



