93 



Parribacus Dana. 



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

 and one variety: Parribacus ursus major (Herbst) and Parrib. ur sus major (Herbst) var. carinata 

 Pfefter. Parrib. paftyraceus, 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. 

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

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

 adult specimen from the same locality. 



As regards Parrib. Parrae (H. M.-Edw.) from the Antilies, it has not yet been 

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

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

 p. 193 and E. von Martens, in: Archiv f. Naturg. XXXVIII, 1872, p. 124). 



Parrib. ursus major (Herbst), which was probably already known to Rumphics, is 

 distributed not only 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. ursus 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. 



1. Parribacus ursus major (Herbst). 



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



Tab. XXX, Fig. 2. 

 Scyllarus antarcticus N. T. Lund, Om Slaegten Scyllarus, in: Skrivt. naturh. Selsk. Kjöben- 



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

 Ibacus antarcticus H. Milne-Edwards, Hist. Nat. Crustacés, II, 1837, p. 287. 

 Parribacus antarcticus J. D. Dana, U.S. Expl. Exped. Crust. I, p. 517, PI. XXXII, fig. 6, 1S52 



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

 Paribaccus antarcticus H. Balss, Ostasiatische Decapoden II. Die Natantia und Reptantia, 



München 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 24/25. Anchorage off Beo, Karakelang-islands. 13 m. Bottom mud and sand. 

 1 male. 



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

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

 line, without the rostrum, 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" 1 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 



