BRACHYURA AND MACRURA 285 



Distribution. — Galapagos Islands (type locality ; also collected by 

 the Albatt'oss) ; Chile (Miers). 



Microphrys platysoma (Stimpson). 



Tagus Cove, Albemarle Island, on reef north of Tagus Hill, March 

 16, I female. 



Distribution. — 'Lower California; Porto Rico, 4 to 14 fathoms. 

 New to the Galapagan fauna. 



Microphrys branchialis Rathbun. 



Microphrys branchialis Rathbun, Proc. U. S. Nat. Mus., xxi, 577, pi. XLI, 

 f. 5, 1898. 



Two small males were collected at Tagus Cove, one in 12 fathoms, 

 the other on the reef north of Tagus Hill. They vary from typical 

 specimens from Lower California in the following particulars. The 

 carapace bears fewer tubercles, the postero-lateral spine is reduced, 

 the oblong branchial protuberance is more prominent, the rostral horns 

 and the antero-external spine of the basal antennal joint are shorter. 

 These variations are no greater than those afforded by Microphrys 

 bicornutus (see A. Milne Edwards in Crust. R^g. Mex., pi. xiv, 

 figs. 2-4). 



M. branchialis was hitherto known from the Gulf of California and 

 the west coast of Lower California in 1 2 to 48 fathoms. 



Suborder MACRURA. 

 Family SCYLLARID^. 



PSEUDIBACUS PFEFFERI Miers. 



Pseudibacus pfefferi Miers, Proc. Zool. Soc. Lond., 1882, p. 542, pi. xxxvi, 

 figs. 2 and 3. 



Following is a description of the specimen in hand : Carapace about 

 one third broader than long, concealing the legs. The surface is 

 nearly smooth ; there is a short tuberculated median crest on the gastric 

 region ; two similar longitudinal crests separated by a narrow median 

 depression on the cardiac region ; posteriorly these crests unite in one 

 which is continued to the posterior margin of the carapace ; a few 

 depressed tubercles form a longitudinal line toward the inner side of 

 each branchial region ; a tuberculated ridge runs parallel and close to 

 the outer margin of the branchial region. The lateral margin is arcu- 

 ate, interrupted at the anterior third by a V-shapcd notch, from which 

 a short, smooth ridge extends inward on the carapace. The margin 



