74 IOWA STUDIES IN NATURAL HISTORY 
Crangon cylindricus (Kingsley) 
Alpheus cylindricus Kingsley, Bull. U. 8. Geol. Survey, IV, art. 8, (1878), 
p. 192. Coutiére, Ann. Sci. Nat., Zool., Paris, (8), IX (1899), p. 
81, text fig. 44, p. 228, text fig. 278. Zimmer, Zool. Jahrb., Suppl. 
11, hft. 3, (1913), p. 394. 
D.S. 1, May 18; one specimen. D.S. 20; 2 (1 ovig.). Bar- 
bados, May 15; one specimen. 
After examining the specimens here listed, with front and 
large chela closely approximating Coutiére’s figures, of which 
the first only is cited by Zimmer, I find I must have been mis- 
taken recently® in thinking his specimens should be considered 
as C. cristultfrons (Rathbun). From this species C. cylindricus 
differs in having an unkeeled rostrum, a characteristic large 
chela, figured by Coutiére (loc. cit., text fig. 44), quite different 
from the rather Synalpheus-like hand, though with thick, curved, 
swollen finger, of C. cristulifrons not greatly unlike the hand of 
C. crinitus also figured by Coutiére (loc. cit., p. 226, text fig. 
273) ; the second legs have differently divided carpi, in C. cylin- 
dricus as Kingsley has it, ‘‘ecarpus of second pair jointed, first 
pair equalling the following three; second as long as third and 
fourth which are equal, fifth longer than fourth,’’ while in C. 
cristulifrons ‘‘the carpal joints of the second pair diminish as 
follows: Second, fifth, first, fourth and third; the second being 
as long as the third, fourth and fifth together’’ (Rathbun) ; in 
the latter the meri of the third and fourth legs are spined be- 
neath, in the former they are unarmed. 
Crangon rathbune, new species 
D.S. 20; 3 (1 ovig.). Okra Reef, Barbados, May 13; 20 (7 
ovig.). Barbados, May 15; 4 (1 ovig.). Needham’s Point, 
Barbados, May 18; 5 (3 ovig.); the complete @ is the type. 
Barbados, coral rock, May 31; 9 (4 ovig.). Barbados from 
coral heads, June 4; 3 (1 ovig.). 
A species which resembles some of the members of the obeso-manus 
group of ‘‘ Alpheids,’’? though the dactyl does not seem quite so typically 
hammer-shaped. 
8 Macruran, Anomuran and Stomatopod Crustacea, collected at Curacao 
by Dr. C. J. van der Horst in 1920. Bijdragen tot de Dierkunde, Ams- 
terdam, XXIII (1924), p. 65. 
9Coutiére, Amn. Sci. Nat. Zool., Paris (8), IX (1899), p. 351. De 
Man, Siboga Exped., monog. XXXIX al, Decapoda, pt. 2, Alpheide, 
(1911), p. 307. 
