While the second form ..f males w 



(Jauiharus of which any number of 



was found in none of the species of . 



covery of dimorphism in the males 

 Prof. Agassiz. It is mentioned that 



ence in the Crustacea of two form 



unique," and a short account of ai 



and in insects is given. Anion- th. 

 the occurrence of sterile fcMiKil.s in 



states that he has "found similar t 



gular abdomen in some other genci-; 



rence of dimorphic sterile females 



Theo 



Brachyura than this would imply. Delia 

 species of P 



ch more common among 

 figures such forms in several species of Portunids, and the v 



has noticed them in Neptnnm, Ac/teloUs, EpUobocera, and Pinno^ 



theres. In all these cases the abdominal appendages are more or 



less rudimentary and not well adapted for the attachment of eggs. 



Thirty-two species of (Jamharus and six of Astacns are de- 



scribed, and eleven species, all Cambari are 

 of the species is followed by an extended 

 graphical distribution. The author rema. 



new. The description 



account of their geo- 



•ks on the absence of 



crawfish in central and eastem New Kn-lMi. 



<| un<l the eastern Fj 



tion of British America, and does not seem 





their occurrence in the St. Johns and Ari^osl 





The eleven plates contain figures of the 



Hrstabdon'unallegBof 





th<- species, from the 



^h^^<wii^'\;n!i'i,!::;;H,;;n;'::;';''^^ 



lllgurlsoftheei^ire 



animals of eight species 





5. PreUmlnar./ A\y>or,' on fl„ <'rustnr,a 



Mned in t/ie'k 



Stream in the Straits nf ll,,ri<l<, ■ ],v I F 



nrlVi-rTViES At^siet- 



U. a Coast Survey. Pa.m I Dmrlnmn, ■ 



' r (Hiv I)r "VViil- 



LIAM Stimpsox. 'n.ili^.tin of tlu. M'u^.uin > 



';;'r;,n.p.xo<,i.:voi.ii, 



Dr. Stimpson giv.-s a full' li^t of tin- lirachvura collected by tne 

 Coast Survey dre<lging expeditions of 1 H07-H-9. H 1 species, repre-, 

 senting 47 genera, are mentioned, and 52 of the species and 19 o 

 the genera are described as new. More than half the species ^ 

 long to the ]\Iaioidea, while the Ocypodoidea are represented dJ 

 only two species, both of them belonging to the CarcinoplacW* 

 Only a small proportion of the species are from great depths, a" 

 the number of new forms seems lar<xely due to the thorougH ^ 

 ploration of the shallower waters. But 15 si)ecie8 are recorded a^ 

 coming from below 100 fathoms, and of these 11 are MaioKma'- 

 the other 4 are Cancroids-a Pihimnvs, 2 species of Bathyne>^^^ 

 (a new genus allied to Portunus) and a si)ecies of AeheloiU. 



•Reports on the Natu 

 Yale C jllege, there are ap 



