THE CANCROID CRABS OF AMERICA 53 



tooth larger than the next or second lateral tooth and about as 

 advanced as the frontal teeth. Lateral teeth sharp, curving forward, 

 and having a tendency to alternate in size, the second, fourth and 

 sixth a little smaller; sinuses wide. Lateral spine about three times as 

 long as the adjacent tooth. Orbital fissures V-shaped, the angles of 

 the outer fissure thickened, subdentiform. 



Merus of cheliped with 4 to 6 (most often 5) spines on the inner 

 margin, and a distal spine on the posterior margin. Carpus with a 

 longish spine at inner angle and a smaller spine at distal end of outer 

 carina. Manus with 7 granulated ridges, a spine at the proximal end 

 and another at the distal fifth of the inner margin of the upper 

 surface. Infero-distal end of merus of swimming legs spinulous. 



Measurements. — Male (21782), total length of carapace 28.6, width 

 of same 57.1, width between anterior bases of lateral spines 45.6, 

 fronto-orbital width 20.8, width across four frontal teeth 6.9 mm, 

 Male (22026), total length of carapace 12.6, width of same 26, width 

 at anterior base of lateral spine 18.7, fronto-orbital width 11, width oi 

 front 3.4 mm. 



Young. — The carapace is a little narrower than in the full grown, 

 the lateral spine relatively longer, as long as the width of the next 

 four or five teeth, the frontal teeth wider. In the very young, 7 mm. 

 long and smaller, the lateral spine is inclined more forward and is 

 about as long as the width of three teeth, the frontal teeth are much 

 shorter and broader, the antero-lateral teeth more unequal. 



Range. — Puget Sound (accidental). From Santa Monica Bay, 

 California, to Gulf of California, Mexico. 



Material examined. — See table, pages 54-55. 



THE ACUMINATVS-ASPER-PANAMENSIS GROUP 



The species of this group have so much in common and the varia- 

 tion within the species is so great that is is difficult to determine 

 whether they should be considered as forms of a single species or be 

 recognized as three species, as described by Stimpson. The characters 

 common to all are as follows: Carapace pubescent except on the ele- 

 vated granulated ridges and patches; protuberances few in number 

 and large, being on the gastric, cardiac, and inner branchial regions; 

 marginal teeth granulated and pubescent; middle pair of frontal 

 teeth smaller and more advanced than the outer pair, and the outer 

 tooth of the orbit; inner orbital tooth bidentate; the antero-lateral 

 teeth in general diminish in width from the first to the eighth, at the 

 same time becoming longer and more spiniform. There is a small 

 spine at distal end of outer margin of arm, no spine at distal end of 

 upper margin of palm, but a spine is present behind the extremity. A 

 spine at distal lower angle of merus of swimming leg terminates a row 

 of spinules on the distal edge. 



