small spines. Sternum granulate except for con- 

 cave portion between chelipeds. 



Chelipeds approximately twice as long as cara- 

 pace, granulate, margins spinous; hand swollen; 

 fingers more than half length of palm, slightly 

 gaping. Walking legs granulate, with tufts of 

 curled setae and often small spines; first pair 

 longest, others successively shorter. 



Abdomen of males with six, females with five, 

 free segments. 



Measurements. — Carapace: male, length, 14 

 mm. ; width, 12 mm. 



Variations. — Kathbun (1925) divided the spe- 

 cies E. rastellifera into a northern subspecies, 

 marthae (ranging from Nantucket to southern 

 Florida), and a southern or Caribbean subspecies, 

 acuta, (ranging from Cuba to Grenada and Barba- 

 dos), with a region of intergradation in the 

 Florida Keys from which rastellifera was origi- 

 nally described. The southern subspecies (acuta) 

 has longer, sharper, and more slender spines than 

 marthae, and a narrower, higher, and more closely 

 and finely roughened carapace with regions more 

 deeply separated than in the more northern forms. 

 Likewise, the chelipeds have spines on the border 

 of the merus well developed and legs more spinu- 

 lose than in the northern forms. 



Rathbun pointed out that there is considerable 

 overlap in distribution of these subspecies, listing 

 acuta from as far north as Marthas Vineyard. 

 Such subspecific treatment seems untenable today, 

 for such overlap of geographic range can hardly 

 exist. No typical form was designated. I have 

 retained the subspecific name marthae for the 

 Carolinian form simply because this region lies 

 well within the range mentioned by Kathbun, but 

 I have not studied all of the material compara- 

 tively. 



Habitat. — The species has been reported from 

 a variety of sandy and muddy bottoms; 44 to 217 

 fathoms. 



Type locality. — Southwest of Marthas Vine- 

 yard, Mass., laf . 40° N. long. 70°57' W., 85 fathoms. 

 Known range. — Off Georges Bank (lat. 40°35' 

 N. long. 67°37' W.) to Carysfort, Fla. 



Remarks. — Kathbun (1925) reported an oviger- 

 ous female off Mart lias Vineyard in July, and 

 are known off Georges Bank in November 

 (U.S. National Museum records) . 



Genus Batrachonotus Stimpson, 1871 



Rathbun, 1925, p. 122. 



Batrachonotus fragosus Stimpson 



Figures 214, 223C 



Batrachonotus fragosus Stimpson, 1871a, p. 122. — Rathbun, 

 1925, p. 123, text-fig. 48, pi. 39, figs. 1-4 (rev.). 



Recognition characters. — Male. Carapace tri- 

 angular, broadly expanded behind; gastric, car- 

 diac, and branchial regions strongly protuberant, 

 each surmounted by a stout spine or large tuber- 

 cle; intestinal region with two small tubercles 

 just above posterior margin ; hepatic region angu- 

 lar, approximating postorbital tooth. Cervical de- 

 pressions deep and broad giving carapace superior 

 outline much like frog's back. Rostrum short, 

 formed of rounded lobes separated by a shallow 

 notch, scarcely projecting beyond antennulary 

 fossae, margin and supraorbital margin denticu- 

 late. Basal articles of antenna with dentate mar- 

 gins and a small tooth at anterior extremity. 

 Merus of outer maxilliped broad with prominent 

 outer and inner anterior angles. Abdomen and 

 sternum granulate except for smooth area be- 



Figube 214. — Batrachonotus fragosus Stimpson. Animal 

 in dorsal view. letfs of ri^'lit side shown in approximate 

 position, le^'s of left side not shown. 2 mm. indicated. 



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