THE STOMATOPODA OF PORTO RICO. 
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segments smooth ancl without carinse or spines, except posterior-lateral spines on the fourth and fifth 
segments; sixth segment with 6 strong spines, the intermediate pair arising farther forward than the 
others, about half way between the anterior and posterior margins; a high, narrow crest ending in a 
spine and 6 other carinte on the telson, one pair on the lateral margins, and two pairs grouped near the 
crest, the pair nearest the crest being the smaller; 6 marginal spines, the submedian pair long and 
mobile; 2 simple spines on the basal prolongation of the uropod, of which the inner one is the longer; 
8 to 10 mobile spines on the exopodite. 
• General description. — The specimens in the collection from Porto Rico differ from Miers’s 
description in that the posterior margin of the carapace is not straight, but distinctly concave, and in 
having minute posterior lateral spines on the fourth as well as the fifth abdominal somite. In his 
figure the basal prolongation of the uropod is represented as extending as far as the tip of the exopodite, 
and the endopodite appears to equal the proximal segment of the exopodite in length. In our 
specimens the basal prolongation extends only so far as the tip of the endopodite, which, however, 
is considerably longer than the proximal segment of the exopodite. (In fig. 4 the basal prolongation 
is represented as a little too long, and the spines should be more slender and less sinuous on their 
inner margins. ) The distal segment of the exopodite is less than two-thirds the length of the 
proximal one. Brooks found these segments to be equal in specimens from the Pacific, but the 
distal one shorter in specimens from St. Thomas. He found also that the posterior lateral angles of 
the fourth abdominal segment were rounded and without spines in specimens from the Pacific. His 
specimens from St. Thomas differed from those from Honolulu in having the spines of the basal 
prolongation of the uropod equal in length. But our specimens from Porto Rico agree with those 
from the Pacific in having the inner spine the longer. As Brooks has pointed out, this species 
probably varies to a considerable extent, and the slight differences observed do not furnish sufficient 
ground for dividing it. P. ciliata is distinguished from P. ornata Miers by its cylindrical eyes, the 
eyes of P. ornata being flattened and club-shaped. It is separated by the number of carinse on the 
telson from all other species having a similar basal prolongation to the uropod. 
Color . — Living specimens observed at Bimini (Bigelow, ’94) showed great variation in coloring, 
which closely resembled that of Gonodactylus cerstedii. 
Size. — The largest specimen in the present collection measures 8 cm. in length. 
Geographical distribution . — This is perhaps the most widely distributed of all the Stomatopods. 
It is common in the West Indies, living on shoals of coral sand associated with Gonodactylus cerstedii, 
and is found also at the Cape Verde Islands. In the Indo-Paeific region it has been taken from the 
Red Sea, Mauritius, Ceylon, Japan, and from various localities in the Malay Archipelago, South Sea 
Islands, and Hawaii. On the Porto Rico expedition the Fish Hawk obtained specimens in San Juan 
Harbor, Ensenada Honda in Culebra, Mayaguez Harbor, Boqueron Bay, Fajardo, Playa de Ponce, and 
