1917 J^^"f/J on Taxonomii of Crabs 357 



tubercled ventrally. the last pair rudimentary and folded in the branchial 

 chamber; dactyls thick, spiny, dark colored. Color very brilliant, scarlet 

 or orange, with bright purple markings particularly on ventral part of the 

 body and the spines on the legs. 



In 1915 six were secured, but in 1916 only 1, a male. This male 

 was found in North Bay near Arg}'le (14) at 9 fathoms. Its width from 

 spine to spine across the cardiac groove was 260 mm. ; its length from the 

 tip of the rostrum to the posterior edge of the carapace was 220 mm. Not 

 abundant. 



2. Lopholithcdes foraminatus Stimpson (not figured) 



Echinocerus foramiiwtiis Stimpson. 



Very similar to L. mandtii; carapace much more depressed ; cone-like 

 projections on back not so prominent. The most striking feature of this 

 species is the circular opening formed by the depression in second joint 

 of the cheliped. and one opposite it in the first pair of walking legs. These 

 openings are prominent when the feet are folded in front of the carapace. 



None was found during the season of 1916, but have been found in 

 previous summers in North Bay (15) near Argyle (14) in about the same 

 habitats as L. mandtii. Not abundant. 



Tribe Brachyura 



KEY TO FAMILIES 



A. Carapace usually quadrilateral ; verges of male inserted either in 

 sternal plastron or basal joints of the fifth pair of legs. 



B. Carapace hard and firm; front, orbits and eyestalks not very small; 

 buccal frame quadrate anteriorly; species of moderate size. 



GRAPSIDAE (p. 358) 

 BB. Carapace more or less membranaceous; front, orbits and eyestalks 

 very small ; buccal frame arenate anteriorly ; species small. 



PINNOTIIERIDAE (p. 359) 



AA. Carapace not ({uadrilateral ; verges of males inserted in basal joints 

 of fifth pair of legs. 



C. Carapace broad, short, rounded anteriorly; rostrum not projecting. 

 D. Antennules folded longitudinally ; front with several teeth, of 



which one is median, cancridae (p. 363) 



DI). Antennules folded obli(juely or transversely; front with or with- 

 out median tooth. pilumnidae (p. 367) 

 CC. Carapace usually triangular; rostrum projecting, j)ointed or spined. 



maiidae (p. 367) 



