PART 1 GARTH : PACIFIC OXYRHYNCHA 55 



living Pocillopora coral. The male neotype was covered with a 

 filamentous alga identified by E. Yale Dawson as Cladophora hesperia 

 S. and G. 



Depth: Intertidal, with the exception of one Zaca station in one 

 fathom and one Velero IV station at the same depth. 



Size and Sex: Specimens range in size from a 5.0 mm male cracked 

 from coral to one of 14.3 mm, which is considerably larger than the 

 11.0 mm proposed neotype, and the largest specimen on record. Ovigerous 

 females of from 7.0 mm to 12.5 mm are present in the series. 



Breeding: Females with ova were encountered by Hancock expedi- 

 tions in the Gulf of California in March, by William Neil Smith, II, 

 at Tiburon Island in mid-June, when 15 of 16 females collected were 

 in berry, and by E. Yale Dawson at La Paz in November. 



Remarks: As compared to Eucinetops panamensis, E. lucasi is more 

 rotund, epecially in the branchial areas. The longitudinal row of 

 spinulous tubercles is well within the lateral margins, instead of appearing 

 to delimit them. The tubercles of the carapace are restricted to the 

 prominent areas instead of being scattered generally. The rostral horns 

 are cleft nearly to their bases instead of less than half way. The 

 postorbital spine is acute and slender instead of equilaterally triangular. 

 The first movable antennal article, while broad, is seldom as broad as 

 the rostral spine. The eyestalks are longer and extend considerably 

 beyond the postorbital spine. The male first pleopod has an attenuated 

 flange opposite its sharp tip in place of a slight swelling opposite a blunt 

 tip. (Cf. Plate B, figs. 4 and 5) 



It will be seen from the above description that the Eucinetops char- 

 acterized agrees more closely with Lockington's description of Peltinia 

 longioculis, which was based upon a male specimen, than with Stimpson's 

 description of the female Eucinetops lucasi, particularly as regards the 

 long eyestalk and the cheliped. (Stimpson's male specimen was of 

 another species and became the type of Rathbun's E. rubellula.) It 

 departs from both, however, in that the rostral spines are acute, not 

 blunt, in the proposed neotype and in the large majority of the specimens 

 examined. Hancock expedition material therefore supports the conclusion 

 that the rostrum is variable and that Stimpson's specimen was abnormal 

 in this respect. This was the conclusion reached by Crane (1937, p. 54) 

 in reporting two Gulf of California specimens obtained by the Zaca. 

 Because of the desirability of establishing the several Eucinetops species 

 on the firm characters afforded by the male cheliped and male first 

 pleopod, a neotype of the opposite sex to Stimpson's type was selected. 



