570 pjtocEEDixas of the national museum. 



Tlio basal joint of the antenna is wider than in inermis; the lobes of the 

 outer niiir^in Jiro larger. The sternum of the male is granulated; the 

 abdomen ol'botli sexes is nearly smooth; the first segment has a median 

 tul)ei('l(\ 



(31ielii)e(ls smooth; lingers gaii)ing widely to near tlie tips; dactylus 

 with a sliort truncate tootli near its bas(5; jjollex with a large tooth at 

 one third the distance from the proximal end. Ambulatory legs stouter 

 and shorter than in T. incriiiis. 



Dimensions. — Male: Length, 11. (5 mm.; width, !>.5 mm. l-'emale: 

 Length, 10.3 mm.; width, 8 mm. 



Type. — No. 21571, U.S.N.M. One male from Magdalena Bay, Lower 

 California, 12 fathoms, station 2831. 



Additional specimen. — A female of this species was taken in the 

 southern i)art of the Gulf of California, 10 fathoms, station 2828. 



7. BATRACHONOTUS NICHOLSI Rathbun. 

 lialrachonotuH iiirholxi Katuhun, Proc. U. S. Nat Miis , 18!) J, XVII, p. ~>b. 



Off the west coast of Lower California, from Cape St. Lucas to Abreojos 

 Point, 12 to 51 fathoms, stations 2829, 2831, 2833, and 2834. 



This sijecies was founded on two small dried females. The present 

 si)ecimens are larger, show both sexes, and indicate that the species is 

 very closely related to Ji. frnfiosus Stimi)Son of the West Indies. It 

 differs chiefly in the longer postorbital tooth, which is as long as the 

 eye; in the more elevated i)reorbital border, which at its highest point 

 forms a tooth, or in some specimens a spine; in the coarser granulation 

 of that part of the sternum of the male between the chelipeds; and in 

 the evenly toothed fingers of the male, while in fragosus the i)ollex has 

 a larger tooth at its middle. The female is narrower than the male. 

 The tnberculated portions of the different regions are more extensive 

 than in the types. ^ 



Diminsion-s. — Male: Length, 9mm.; width, 7.9 mm. l<'emale: Length, 

 0.5 mm; width, 5.4 mm. 



8. DASYGYIUS DEPRESSUS (Bell). 



MicrorhifnchuH dvj>resHUH 1?ki,l, I'roc. Zool. Soc. Lomloii, 18;?5, III, p^ 88. 

 Southern ])art of the (Julf of California, 21 and 20A fathoms, stations 

 2822 and 2S23. 



g. DASYGYIUS TUBERCULATUS (Lockington). 



Inachus hihcrctilalux Lockington, Proc. Cal. Acud. Sci., February 7, ISTli, 1877, 



VII, p. :5(). 

 Microrhyiiclnoi (liKichus) lubci-ciilatiis liOCKiNC.TON, Proc. Cal. Acad. Sci., July 17, 



1876, 1877, VII, p. C4. 

 Ncorlnpivhiis mcxicaiiiin Patuiuin, Proc. U. S. Nat. Mus., 189:5, XVI, p. 2:53. 



Panama Bay, 7 and 10 fathoms, stations 2800 and 2802. 

 The identity of my species and that of Lockington has been deter- 

 mined by Mr. S. .1. Holmes, who has examined the types of both. 



