450 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



tuberculate, uncrested, the chief prominence at the internal angle. Merus 

 elongate, outer margin with two, inner margin with six tuberculate 

 teeth, intervening surface convex rather than concave, and bearing two 

 or more tubercles in a linear row nearer the outer than the inner margin, 

 and often a second row of flattened granules. Palms completely rough- 

 ened with rows of low berried tubercles, the second from the superior 

 border best developed. Fingers massive, granulate, tapering abruptly to 

 sharp, recurved tips, dactyl serrate, pollex deflexed, two larger basal 

 teeth. Chelipeds (right and left) characteristically of different size in 

 specimens examined. 



Male abdomen 7-segmented, segment 2 trituberculate, segments 3-5 

 fused, each bearing a transverse ridge to which sediment clings, segment 

 6 with a sharp spine. Male first pleopod cylindrical, sinuous, not taper- 

 ing, tip truncate ; a row of about a dozen stout setae on prominent lip of 

 groove proximally, another row on convex margin ; a tuft of longer setae 

 terminally and on concave margin. Male second pleopod about three- 

 fifths as long as first, similarly bent, a double row of denticles on concave 

 margin of corneous tip. (See Plate Z 2 , fig. 6) 



Material examined: 26 specimens from 12 stations. (See Table 98) 

 From Isabel Island, Gulf of California, Mexico, to Gorgona Island, 

 Colombia. 



Color in life: Carapace dark Eugenia red, tip of rostrum white. 

 Eyestalks white with touch of red, eye dark brownish yellow. Cheliped 

 lighter than carapace, fingers light pinkish cinnamon, tips cadmium 

 orange. Ambulatory legs same as carapace but lighter, fading to cadmium 

 orange at mid-propodus. Ventral side creamish white with Eugenia red 

 on distal portion of maxilliped and on pterygostomian region and a few 

 red dots on abdomen. (Petersen, of a specimen from Isabel Island, 

 Mexico) 



Habitat: Most frequently dredged on rock bottom, but with sand, 

 mud, coral, nullipore, or shell secondarily present ; less frequently dredged 

 on sand, with shell or nullipore present; twice dredged on coralline bot- 

 tom. 



Depth: 2-30 fathoms. 



Size and sex: Males in the present series are from 6.8 to 16.4 mm, 

 females from 5.5 to 16.0 mm, ovigerous females from 11.0 to 14.4 mm. 



Breeding: Ovigerous females were taken in Costa Rican waters in 

 late February, and at Tres Marias Islands, Mexico, in early May. 



Remarks: The affinities of the proposed new species are with Par- 

 thenope (Pseudolambrus) excavata Stimpson, to which it has been com- 



