PART 1 GARTH : PACIFIC OXYRHYNCHA 297 



Material examined: 87 specimens from 21 stations. (See Table 61) 

 From Rocky Point, Sonora, Mexico, to Santa Elena Bay, Ecuador. In 

 addition to the above, 10 specimens from 4 Askoy expedition stations 

 (Garth, 1948), and 9 specimens from five Costa Rican and Panamanian 

 localities in the collections of the U. S. National Museum. 



Measurements: Largest specimen, a female: length 19.3 mm, width 

 exclusive of lateral spines 9.7 mm, rostrum 5.8 mm, width 2.2 mm, 

 cheliped 12 mm, ambulatory legs 14, 10.6, 10.2, and 9.6 mm, respectively. 

 Largest male, length 18.4 mm, width 10.5 mm, rostrum 5.6 mm, width 

 2.4 mm, cheliped 20.5 mm, chela 9.7 mm, dactyl 3.3 mm, ambulatory 

 legs 20.6, 13.5, 12.2, and mm, respectively. 



Color in life: Unrecorded. 



Habitat: Gray sand, green sandy mud. (Garth) Excluding the two 

 shore stations, which were rock and sandstone, dredge stations from 

 which the species was recovered show a primary breakdown into sand 

 58 per cent, mud 33 per cent, and rock 8 per cent. The sand was often 

 combined with rock, shell, or mud; the mud similarly contained sand, 

 shell, or rock. None were taken on coral or coralline bottom. 



A specimen from Tangola-Tangola Bay, Oaxaca, Mexico, station 

 259-34, carries a rhizocephalan parasite. 



Depth: Shore to 20 fathoms; exceptionally to 55 fathoms. 



Size and sex: In the Gulf of California males of from 9.5 to 18.4 

 mm, females from 9.0 to 19.3 mm, and ovigerous females from 14.3 to 

 15.5 mm were found. In Ecuador males ranged from 5.8 to 13.0 mm, 

 females from 7.5 to 10.5 mm, ovigerous females 9.0 mm, and young 

 from 3.5 mm. In the intervening territory, Mexico to Panama, males 

 were from 6.5 to 17.8 mm, females from 6.8 to 14.4 mm, ovigerous 

 females from 8.5 to 10.0 mm, and young from 4.0 mm. 



Breeding: Ovigerous females were encountered by the Velero III 

 in the Gulf of California in February and March, off Guatemala in 

 January and March, and off Ecuador in mid-January. 



Remarks: It will be seen from the paragraph on variation above that 

 the character which has heretofore been relied upon to separate genera 

 from one another, namely, the small spine intercalated between the pre- 

 orbital tooth and the postocular cup, is subject in Notolopas lamellatus 

 to intraspecific variation. The writer considers this primary evidence 

 against the division of the Pisinae of Alcock into the Pisinae sensu restr. 

 and Hyasteniinae of Balss (1929) on the strength of this character. 

 Ideally, the key to genera should make allowance for those specimens of 

 Notolopas in which the spine is absent or but weakly developed. 



