70 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



First pair of legs [chelipeds] thicker than, but not much more than 

 half as long as, the others; surface granulated; hand rounded, and 

 terminated by arched fingers meeting only at the apex, and denticulated 

 there. The four posterior pairs of legs on the average nearly twice the 

 length of the body, diminishing in the order 3. 4. 2. 5 [or 2. 3. 1.4, 

 excluding the cheliped] ; cylindrical and hairy; nails long, slender, and 

 but slightly arched. (Bell, 1836, modified) 



Material examined: 20 specimens from 5 Hancock expedition sta- 

 tions. (See Table 6) From Pinas Bay, Panama, to Salango Island, 

 Ecuador. Also 13 additional specimens from 5 Askoy Expedition stations 

 (Garth, 1948, p. 23). 



Measurements: Female neotype: length 7.3 mm, width 6.1 mm. 

 Askoy Expedition male: length 13.0 mm, width 10.7 mm, cheliped 14.3 

 mm, chela 6.2 mm, dactyl 3.2 mm, ambulatory legs 23, 26.5, 25, and 

 21 mm, respectively. 



Color in life: Not recorded. Color in alcohol yellowish-white. (Bell) 

 Habitat: Green sandy mud, gray mud. (Garth) 

 Depth: Hancock specimens were dredged in from 12 to 20 fathoms. 

 Askoy specimens were from 14 to 64 meters. 



Breeding: The single ovigerous female was obtained in late January 

 at Pinas Bay, Panama. 



Remarks: A female specimen from Salango Island, Ecuador, station 

 396-35, was taken by the writer to the U. S. National Museum in 1937, 

 where it was decided in consultation with M. J. Rathbun and W. L. 

 Schmitt that it agreed with the description and figures of Microrhynchus 

 gihbosus Bell at least as well as did a specimen of M. depressus Bell 

 (U.S.N.M. No. 18143) with the description and figures of that species, 

 with due allowance for artistic inaccuracies in both instances. Subse- 

 quently, in 1939, specimens from Pinas Bay, Panama, station 439-35, 

 were compared with a young male (U.S.N.M. No. 73441) collected by 

 H. N. Lowe at Acapulco, Mexico, which, although lacking carapace 

 spines, had been determined by Rathbun as Collodes granosus Stimpson. 

 It was later discovered that the specimen from station 396-35 and the 

 specimens from station 439-35 were identical and that Microrhynchus 

 gibbosus, if correctly identified, was at least congeneric with Collodes 

 granosus, if the two were not actually conspecific. 



Evidence as to the identity of Hancock expeditions material with 

 Collodes gibbosus is here presented in the form of detailed figures of a 

 male specimen from Cape San Francisco, Ecuador, station 216-34 (Plate 

 C, figs. 1-5, 7). Comparison is invited with the original illustrations 



