400 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. :) 



Since Teleophrys tumidus (Cano) has been twice recorded as from 

 the Galapagos Islands, once by Rathbun (1925, p. 443) and once by 

 Boone ( 1927, p. 166) , it was assumed that specimens of this species would 

 be found among the 1,231 specimens from 62 collecting stations which 

 constitute the Velero III Galapagos series of Teleophrys. Indeed, in the 

 early years of this study specimens thought to be tumidus were taken to 

 the U.S. National Museum for comparison with material determined by 

 Miss Rathbun. Substantial agreement was found between them and the 

 Hopkins-Stanford Expedition specimen (USNM Cat. No. 25678) upon 

 which the first Galapagos record of tumidus rests, and on this basis the 

 Hancock series was laboriously separated into " cristulipes" and "tumidus" 

 fractions, not, however, without an inseparable residue. 



The introduction of new material obtained by Hancock Expeditions 

 of 1935 and 1938 in Peru, Cano's type locality, revealed differences be- 

 tween Galapagan and Peruvian specimens which are based upon struc- 

 tural, rather than superficial characters. The Hopkins-Stanford specimen, 

 re-examined in this light, proved to be no more than a particularly cristate 

 cristulipes, which was indeed the original Rathbun determination ( 1902). 

 As a result, the entire Hancock Galapagos series is now referred to cristu- 

 lipes, and doubt is expressed concerning the occurrence of tumidus outside 

 of Peruvian waters. 



The differences between cristulipes and tujnidus, as represented by 

 Galapagan and Peruvian specimens, respectively, are, in the order of 

 relative importance, (1) the long, cylindrical second free antennal seg- 

 ment of cristulipes as compared to the short, broad segment of tumidus, 

 (2) the low, arched front of the adult cristulipes as compared to the elon- 

 gated front and closely approximated rostral horns of tumidus, (3) the 

 less prominent branchial and more prominent hepatic region of cristulipes, 

 giving it a rotund carapace as compared to the more triangular one of 

 tumidus, and (4) the absence of a lateral propodal flange in cristulipes, 

 although its place is sometimes occupied by a low tubercle in Galapagos 

 specimens. The remaining characters mentioned by Rathbun (1925, p. 

 442), such as number of anterolateral spines or spinules, proportionate 

 number of tubercles and granules on the carapace, and entire or dentate 

 margin of the basal antennal article, are subject to considerable variation 

 even among adult specimens. 



Genus STENOGIONOPS (Leach MS.) Desmarest, 1823 

 Key to the Galapagos Species of the Genus Stenocionops 



A^ 9 median spines and 3 lateral spines .... 5. triangulate 

 A^ 8 median spines and 4 or 5 lateral spines .... 5. ovata 



