1894. PROCEEDINGS OF TEE NATIONAL HIUSEFM. 501 



one, which is eigiit-elevenths as long as the former and equals six one- 

 hiiudredths of the total length of the body. The carapace is twenty- 

 two one-hundredths of the total lengtli and about two-thirds as wide 

 as it is long. The abdomen is a little wider and the telson a little nar- 

 rower. Its width is about equal to its length, leaving out the mobile 

 spines, and this is about fourteen one-hundredths of the total length. 



The rostrum is of a broad heart shape, truncated at the base. It is 

 therefore intermediate in shape between the rostrum of P. ornata and 

 P. oculata. The length equals five-sevenths of the width. It covers 

 the ophthalmic segment comi)letely. The carapace is relatively longer 

 than in P. ornata., and is perfectly smooth and without angles. The 

 lateral margins of the exposed thoracic segments are rounded and with- 

 out spines — of the first they are narrow and of the next two broad 

 and truncated. There is a pair of slight projections on the ventral 

 side of the first segment corresponding to the ventral spines in Squilla, 

 and there is a similarly placed pair of larger somewhat conical pro- 

 jections on the next segment. The abdominal segments from the first 

 to the fifth have each a stout spine pointing downward and backward 

 on the ventral median line. All but the first of these segments liave 

 the posterior lateral angle, produced into short siHues. The sixth seg- 

 ment has six. broad dorsal carinfe ending in stout spines, and there is 

 a small additional spine on the inner side of ea^-h of the regular inter- 

 mediate ones. There is no spine in front of the articulation of the 

 uropod. The.telson is most nearly like that of F. oculata. It has the 

 same number of carina',, eiglit besides the crest, and the basal carinae 

 of the submedian and intermediate spines, but while in P. oculata the 

 carina; of the j^air next the lateral marginal pair are parallel to the axis 

 of the body, and point toward the intermediate spines, in this species 

 they are oblique and continue out to the tips of the lateral spines. The 

 submedian cariufe are serrated. The ventral surface of the telson is 

 perfectly smooth. There are no submedian denticles, two intermediate, 

 and one lateral one. The outer one of the two spines of the basal pro- 

 longation of the uropod is the longest, and is very nearly as long as the 

 exopodite, the distal segment of which is larger than in P. ornata. The 

 antenuiB are much longer than in the other two species. The first 

 three segments of the first pair are three-fourths as long as the cara- 

 pace, and the flagelhie are.also of about this length. The antennary 

 segment bears a truncated collar-like process on each side. The 

 second autennje are about tliree-fourths as long as the first. 



The antennary scale is three-fifths as long as the carapace. The 

 raptorial claws are very long and slender. When folded the limb 

 reaches from the eyes to the most posterior part of the carapace. The 

 pectinations are confined to the proximal half of the penultimate joint. 

 The appendages to the walking legs are linear. 



Size. — Length of tlie body, 6.8 cm. 



