THE ECHINODEKMS OF • PORTO RICO. 263 
On the north shore the collecting was all done in the neighborhood of San Juan, 
and brought to light a number of species not taken elsewhere. The Asteroidea 
obtained were Echmaster crassispina , Linckia guild! ng! !, Luldid senegalensis and 
nlathrata , Pentaceros reticuJ atus , Zoroaster fulgens. The following table shows the 
distribution of Ophiuroidea, Echinoidea, and Holothurioidea in this region: 
Station. 
Depth, bottom and 
apparatus. 
Ophiuroidea. 
Echinoidea. 
Holothuroidea. 
San Juan 
Collected by Mr. 
Amphiodia pulchella. 
Ophiothrix angulata. 
Ophiocoma echinata. 
Echinometra suban- 
gularis. 
Toxopneustes varie- 
gatus. 
Cidaris tribuloides. 
Holothuria mexi- 
cana. 
Holothuria surinam- 
ensis. 
Stiehopus mobii. 
Holothuria glaber- 
Gray from vi- 
cinity of San 
Ophiocoma pumila. 
Diadema setosum. 
rima. 
Holothuria grisea. 
Juan. 
Ophiocoma riisei. 
Hipponoe esculenta. 
Holothuria impa- 
Station 6050 
91 fms.; sand and 
Ophiomyxa flaccida. 
Ophiura appressa. 
Ophiura brevicauda. 
Ophiura cinerea. 
Amphiura bihamula. 
. tiens. 
Synapta lappa. 
Station 6051 
Station 6053 
mud; 7 ft. trawl. 
45 fms.; sand and 
mud; tangle. 
4to74fms.; fine sand; 
Ophioglypha robusta. 
Ophioscolex serratus. 
Ophiozona nivea compta. 
Ophioglypha ljungmani. 
Amphipholis limbata. 
Mellita testudinata. 
Station 6054 
dredge. 
44 to 54 fms.; sand 
and mud; dredge 
and tangle. 
Amphipholis goesii. 
SUMMARY. 
An examination of the collections made at the various stations as given above 
shows that Mayaguez and its vicinity proved to be the best locality for the collecting 
of echinoderms, although the vicinity of Culebra Island and that of San Juan Harbor, 
each offers a very good field. At Mayaguez, within a radius of 9 miles, 13 species 
were collected (2 crinoids, 5 asteroids, 25 ophiuroids, 8 echinoids, and 3 holothurians), 
of which 2d were not taken elsewhere and 1 is new to science. In the vicinity of 
Culebra about JO species were taken (1 crinoid, 5 asteroids, 21 ophiuroids, 5 echi- 
noids, and 8 holothurians), of which 11 were not taken elsewhere and 2 are new. At 
San Juan, within a radius of 1J miles, 35 species have been collected (6 asteroids, lb 
ophiuroids, 6 echinoids, and 7 holothurians), of which 8 were not taken elsewhere 
and 2 are new. The littoral collecting at San Juan proved the best, perhaps because 
more thoroughly done, but Ponce is a close second, and nearly a third of the species 
taken at the latter place were not found elsewhere. San Juan proved to be the best 
place for starfishes, Ponce or Culebra for littoral brittle-stars, Arroyo or Ponce for 
littoral echinoids, and San Juan for holothurians. Of littoral forms, the commonest 
starfish is apparently Pentaceros reticulatus , the commonest brittle-star Ophiocoma 
echmata or Ophiothrix a/ngulata , the commonest sea-urchin Toxopneustes variega- 
tus or Echinometra subangtdaris , and Stichopn* /nob!! is probably the commonest 
holothurian. 
Olivet College, September 15 , 1900. 
