26 Bulletin Vanderbilt Marine Museum, Vol. VI 



Linn. Soc. London Zool., ser. 2, vol. XIX, p. 155. 

 Pagurus pictus, Owen, R., Zool. H. M. S. "Blossom" Crust., 1839, 

 p. 83, pi. 25, fig. 2. 



Pagurus decorus, Randall, J. W., Journ. Phila. Acad. Nat. Sci., 

 1839, p. 134. 



Genus: DIOGENES Dana 



Diogenes diogenes (Herbst), ss. Henderson 



Plate 4 



Type: Herbst's type came from the East Indies and is de- 

 posited in the Berlin Museum. 



Distribution : Owing to the confusion of names, it is not feasi- 

 ble to give the full distribution of this species. Dr. Alcock records 

 it as common off the east coast of the Indian peninsula, in depths 

 varying from 6 to 68 fathoms, citing material from five localities. 

 The "Alva" record from Dorian Strait substantially extends the 

 distribution of this species. 



Material examined : One specimen, dredged in 14 fathoms, 

 on muddy bottom, on the Equator, to the south of South Brother's 

 Island, south entrance of Dorian Strait, Lat. 29° N., Long. 104° 47' 

 E., November 6, 1931. 



Technical description : Carapace about one-fourth longer 

 than its greatest width, which is across the branchial region ; pre- 

 cervical portion of the carapace slightly wider than its greatest 

 length; frontal margin excavate and finely serrulate at the base 

 of the ophthalmic segments ; lateral margins also somewhat spinu- 

 lose ; the dorsal surface is well calcified, with numerous spinules, 

 coarse granules and serrate transverse ridges; the postcervical 

 region is covered by tough integument with numerous vesiculous 

 granules and abundant tufts of setae on the branchial region. The 

 abdomen is very coiled, soft, the terga widely separated ; the ap- 

 pendages are restricted to the left side of the second to fifth seg- 

 ments, inclusive ; these appendages are uniramous in the male, but 

 on the second, third and fourth segments of the female they are 

 biramous; the telson and uropoda are calcified, asymmetrical, 

 being larger on the left side. 



The rostrum is one and three-fourths times as long as the 

 ophthalmic scales, or more than a third of the length of the eye- 



