168 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 I 



ferent color markings; variety A, on the other hand, is perhaps closer i 

 to S. panamensis in this respect than any other species. , 



The carapace of S. panamensis, though appearing fairly smooth and 

 shining when wet, on closer examination is quite rough, pitted and finely i 

 eroded, so that when dry it is rather dull and mat surfaced when com- 

 pared with any of its near relatives, especially the median area of the 

 carapace either side of the median carina. In the several "varieties" the 

 median area of the carapace is smooth and shining even when dry, with 

 but few, if any, punctae. 



Squilla parva Bigelow 



Squilla parva Bigelow, Johns Hopkins Univ. Circ, Vol. 10, No. 88, 

 p. 94, 1891; Proc. U.S. Nat. Mus., Vol. 17, No. 1017, p. 518, 

 figs. 11, 12, 1894. Kemp, Mem. Indian Mus., Vol. 4, No. 1, 

 p. 201 [listed only]. 



Distribution: Originally described from the Bay of Panama, 7-16 

 fathoms, green mud, March 30, 1888, and recorded with a reservation 

 from off Manzanillo, Mexico, 117 fathom.s, brown mud, April 26, 1888, 

 this species has since been taken by the Hancock Expeditions at Tangola- 

 Tangola Bay, in 15-20 fathoms; off Petatlan Bay, Mexico, in 25 fath- 

 oms ; and off Cape San Francisco, Ecuador, in 20 fathoms, muck bottom. 



Measurements: The largest parva I have seen is a male 53 mm. 

 long. 



Color: The animal preserved in alcohol is symmetrically more or 

 less marbled and mottled, but between the lateral and marginal carinae 

 the abdominal somites are without color, except on their anterior and 

 posterior margins ; however, the lateral lobes of the free thoracic somites 

 are colored. The penultimate joint of the other branch of the uropods is 

 distally dark colored, and likewise the inner half, approximately, of the 

 terminal joint. The hinder margin of the carapace and all free somites 

 of the body except the 4th thoracic are heavily limned with dark color 

 (black in the alcoholic specimens), as is also the anterior margin of each 

 somite, though less heavily, except in its middorsal portion, where there 

 is a thin and not particularly noticeable line of chromatophores. 



These color notes are based on Hancock Expedition material. All 

 markings, though still faintly discernible, are much faded in the type 

 specimen collected over fifty years ago. 



Remarks: The rostral plate in juvenile parvas is quite triangular. 

 Their coloration sets them apart from S. hancocki, with which I have 

 found them associated, and they may also be distinguished by the reduced 



