120 CALIFORNIA ACADEMY OF SCIENCES. 



at hand, states that it agrees perfectly with the descrip.- 

 tion and figures of Brandti. The specimen Bouvier 

 called inermio, however, may not have been that species, 

 for if it agreed perfectly with Schalfeew's description 

 and figures of Brandti, it could not agree perfectly with 

 Stirnpson's description of inermis. The figure of Brandti 

 shows the squamae on the carapace to be thickly set. 



Genus Acantholithodes Holmes. 



Carapace lyrate, flattened, and covered with setose spines. Rostrum 

 prominent and terminated by strong spines. The first basal joint of the 

 autenure has one or more spines on the outer side; the second basal joint 

 is produced forwards on the outer side into a long, pointed process whose 

 outer margin is armed with several strong spines; acicles pointed, spiny, 

 joined to the end of the second joint above the spiny process; fourth and 

 fifth basal joints subcylindrical. The ischium of the maxillipeds is 

 widened, produced forward at the antero-iuternal angle, and dentate on the 

 inner margin; the last two joints of the palp are not markedly dilated. 

 The legs are covered with setose spines; chelipeds of moderate size; more 

 or less unequal; fingers excavated within and furnished with calcareous 

 teeth and corneous extremities. First of the three pairs of ambulatory 

 legs subequal. Abdomen soft, the integument spiny; the first and last two 

 segments strengthened by calcareous plates. 



Type. A. hispidus (STIMPSON). 



Acantholithodes hispidus (St.). 



Dermaturus hispidus STIMPSON, Ann. N. Y. Lye. Nat. Hist., Vol. VII, 

 1860, p. 242. WHITEAVES, Can. Nat. (2), Vol. VIII, 1878, p. 471. 

 BOUVIER, Ann. Sci. Nat. (7), Tome XVIII, p. 174 et seq., PI. XI, 

 figs. 3 and 16; 1894, PI. XII, figs. 2, 16, and 31; Ibid. (8), Tome I, 1896, 

 p. 19. 



Acantholithodes hispidus HOLMES, Proc. Cal. Acad. Sci. (2), Vol. IV, 1895, 

 p. 575. 



Carapace flattened, lyrate, covered with long setose spines, which become 

 somewhat larger towards the margins. Median region tumid and separated 

 from the cardiac by a very deep, transverse sulcus; a prominent depression 

 between the median and branchial regions. Rostrum quite large and end- 

 ing in three spines; a large fourth spine above and behind the median one. 



