418 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



ever, differs from all Ecuadorean specimens in the elongate rostrum, 

 which is over one-fourth the total carapace length, the close approxi- 

 mation of the rostral horns, and the more posteriorly placed lateral 

 spine. If these characters persist in the adult, as suggested in Stimpson's 

 description of a female from the Gulf of California, given above, his 

 Pericera fossata should be withdrawn from synonymy and applied to the 

 northern species. 



Material examined: Allan Hancock expeditions material : 3 speci- 

 mens from 3 stations. (See Table 88) Agua Verde Bay, Gulf of Cali- 

 fornia, Mexico, and Manta, Ecuador. U. S. National Museum material: 

 Salinas, Ecuador, September 12-14, 1926, Waldo L. Schmitt, collector, 

 3 males and 1 female. 



Measurements: Largest specimen, male: length 40.6 mm, width in- 

 cluding spines 41.5 mm, width without spines 31 mm, rostrum 10.0 

 mm, width 9.0 mm, cheliped 51.5 mm, chela 23 mm, dactyl 9.5 mm, 

 height of palm 6.5 mm, ambulatory legs 41, 32, 29, and 26.5 mm, 

 respectively. Female specimen: length 24.1 mm, width including spines 

 24.2 mm, width without spines 17.5 mm. 



Color in life: Not known. In preservative the male is a brown red, 

 the red predominating on the outer surface; the female is a darker brown 

 without any admixture of red. (Bell) Dark buff, inclining to brownish. 

 (Stimpson, of Pericera fossata) 



Habitat: Sandy mud. (Bell) From floating weed. (Crane) Velero 

 HI specimens were obtained once intertidally on a sand and rock beach, 

 once from a reef over which the surf was breaking, and once by means 

 of a clam rake from a protected shore. The Schmitt specimens are be- 

 lieved to have been shore collected. 



Depth: Intertidal. To 11 fathoms. (Bell) 



Size and sex: Males in the present series are from 16.1 to 40.6 mm; 

 the single female measures 24.1 mm and is without ova. 



Remarks: Macrocoeloma villosum is another species of which Rath- 

 bun (1925) possessed no specimen for illustration. Previously known 

 specimens included Bell's 43 mm male type from the Bay of Guayaquil, 

 Stimpson's 33.5 mm female from Cape San Lucas, and Nobili's 45.5 

 mm male and 35 mm female from Santa Elena Bay, Ecuador. Of these 

 only Nobili's specimens are extant. The situation has been remedied as 

 of late by the collecting activities of Waldo L. Schmitt, the Zaca, and 

 the Velero III. However, the fact that specimens continue to come from 

 two widely separated localities, Ecuador and the Gulf of California, and 

 that these show consistent variation, may indicate that two species should 

 be recognized, rather than one, as at present. 



