37 (36) Eyes without orbits; eyestalks retractile against acute postocular spine, affording 

 no concealment ; proximal (fused) antennal article extremely slender (viewed ventraliy) 

 Subfamily Inachinae 38 



37 (36) Eyes with commencing orbits, each composed of cupped postocular process into 

 which eye retracts, and supraocular eave; proximal (fused) antennal article not ex- 

 tremely slender (viewed ventraliy) Subfamily Pisinae 39 



Figure 71. — Orbital areas of spider crabs in ventral view; A, Inachinae; B, Pisinae. 



38 (37) Fused proximal article of antenna terminating in single blunt spine. [Rathbun 



(1925) recognized New England form as subspecies marthae.] Euprognatha rastellifera 



Figure 72. — Euprognatha rastellifera, portion 

 of body in dorsal view. 



38 (37) Fused proximal article of antenna with compound lateral spines . 



CoUodes robustus 



Figure I'i.—Collodes rohustu.s, portion 

 of body in dorsal view. 



26 



