590 THE AMERICAN NATURALIST. | [Vor. XXXIV. 
A’. Carapace thin, membranaceous, yielding to slight pressure 
P. faóa (Dana), AP 
Genus Pinnotheres Latreille. 
Key to Species. 
A. Palm widening towards the distal end. 
B. Last joint of palpus of outer maxilliped very slender and much 
smaller than the preceding joint. 
C. Carapace of female very thin and membranaceous. Surface 
smooth and shining . . P. ostreum Say, MS 
C. Carapace thicker and ires. Surface covered with a dense 
pubescence... . . . . P. maculatus Say, MSG 
Fic. 14. — Pinnotheres maculatus, d. Fic. 15. — Palicus bahamensis. 
B'. Last joint of palpus of outer maxilliped large, more than half the 
width of the t joint. ; P. nudus Holmes, D 
A’. Palm linear. F. AUN Say, « Qur southern coast.” 
Genus Raphonotus Rathbun. 
Key to Species. 
A. Palm of cheliped widening from the proximal to the distal end 
R. subquadratus (Dana), AP 
A'. Palm of cheliped not widening from the proximal to the distal end ; 
slightly swollen at the middle . . Æ. Jowed Rathbun, sp. nov. rA 
Genus Echinophilus Rathbun, nov. Æ. mellitæ Rathbun, sp. nov., 2 MSG 
Genus Cryptophrys Rathbun. . . .. C. concharum Rathbun, PD 
Genus Opisthopus Rathbun O. transversus Rathbun, D 
Genus Zaops Rathbun, nov. . . . . . . Types Z. depressa (Say), M 
1 Types, U. S. Nat. Mus., No. 23,437, San Pedro Bay, Cal., in siphon of Pholas 
pacifica ; H. N. Lowe, collector ; 2 9. 
bic U. S. Nat. Mus., No. 23,434, Pensacola, Florida, on Mellita testudi 
nata ; J. E. Benedict, collector. 
