93 



Parribacus Dana. 



This genus, established by Daxa in 1852, seems to be represented only by one species 

 and one variety: Parribacus iirsns major (Herbst) and Parrib. ters7is major (Herhst) var. carinata 

 Pfeffer. Parrib. papyraceiis, indeed, a species described by Miss Rathbun in 1906 after two 

 male specimens from the Hawaiian Islands, has turned out to be a juvenile stage of Parrib. 

 tirsus major, when a young specimen of the latter species from Sagami-bay, Japan, which 

 presented all the characters of Parrib. papyraceus, had been compared by Dr. Balss with an 

 adult specimen from the same locality. 



As regards Parrib. l\xrrac (II. M.-Hdw.) from the Antilles, it has not yet been 

 established with certainty, whether this form should be considered as identical with Parrib. 

 iirsiis major or not (confer: R. Gibbfs, in: Proc. Americ. Assoc, advanc. of Science, 1850, 

 p. 193 and E. VON Martens, in: Archiv f. Xaturg. XXXVIII, 1872, j). 124). 



Parrib. iirsus uiajor (Herbst), which was probably already known to Rumphius, is 

 distributed not onh- throughout the whole Indopacific, though it has not yet been observed 

 in the Red Sea and on the east coast of Africa, as far as I know, but it occurs also in the 

 Caribbean Sea and on the coast of Brazil. The variety carinatus was captured in the Pacific. 



Parrib. ursiis major (Herbst) was taken at a depth of 150 m. in Sagami-bay, Japan, 

 but occurs also in shallower water and even at the surface. 



I. Parribacus tirsiis major (Herbst). 



Cancer (Astacus) iirsus major J. F. W. Herbst, Krabben und Krebsc, Bd. II, 1793, p. 82, 



Tab. XXX, Fig. 2. 

 Scyllarus antarcticns N. T. Lund, Om Slaegten Scyllarus, in: Skrivt. naturh. Selsk. Kjobcn- 



havn, Bd. 2, Heft 2, 1793, p. 22. 

 Ibacus antarcticus H. Milne-Edwards, Hist. Xat. Crustaces, II, 1837, p. 287. 

 Parribacus antarcticus J. D. Dana, U.S. Expl. Exped. Crust. I, p. 517, PI. XXXII, fig. 6, 1852 



(given by error, Ibacus antarcticus, with the description). 

 Paribaccus antarcticus H. Balss, Ostasiatischc Decapoden II. Die Natantia und Rcptantia, 



Mimchen 1914, p. 81. 

 Synon.: Parribacus papyraceus M. J. Rathbun, The Brachyura and Macrura of the Hawaiian 



Islands, Wash. 1906, p. 897, PI. XVIII. fig. 5. 



Stat. 131. July 2425. .Anchorage off Beo, Karakelang-islands. 13111. Bottom mud and sand. 

 I male. 



This specimen is not yet adult, measuring 125 mm. from the distal end of the external 

 antennae to the extremity of the tclson ; the carapace is 41 mm. long, measured in the middle 

 line, without the ro.strum, and 46 mm., the rostrum included, while the distance between the 

 antero-lateral angles of the carapace measures 57 mm. 



The outer margin of the 4''' joint of the external antennae is armed on the right with 

 7 teeth, on the left with 6, but the spine at the anterior extremity of the left joint carries a 

 small secondary spine on the middle of its outer margin. This fact was already observed by 

 DE Haan in Japanese specimens of this .species. Conformable to this author also the terminal 



