636 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



Canu, who proposed the genus Collocheres, determined the identity of Cyplo- 

 picera gracilicauda and Ascoviyzon comatulm, and recorded it also from the coast 

 of France. 



Giesbrecht has reported it, under the name of Clausomyzon gracilicauda, from 

 the Bay of Naples, and G. O. Sars has recorded it from Ris0r on the southern 

 coast of Norway. 



In depth it ranges from the shore line down to 35 fathoms. 



Family ASCIDICOLID^. 



ENTEROGNATHUS COMATUL.E GIESBRECHT. 



This curious copepod was first discovered by Dr. Jolm Beard in the course 

 of his studies at Naples on the development of the myzostomes. It was described 

 in great detail by Dr. W. Giesbrecht in 1901. 



This parasite is much commoner in comatulids from a considerable depth 

 than in those from shallow water. On the average there is only about one parasite 

 to a dozen of the latter, and occasionally Giesbrecht found not a single example 

 in about 50. On the other hand, of the Antedons from the Secca di Gajola at 

 least half were parasitized. 



There appears to be rarely more than one copepod in a single Antedon, though 

 once Giesbrecht found four in different developmental stages in a specimen from 

 the Secca di Gajola. 



The females with egg balls are found throughout the year. 



Almost the only color which the mature female shows is the brown of the 

 contents of the intestinal canal. The animals are pale and almost transparent 

 if the fatty tissue is not too richly developed, and the oviduct is not too full of 

 ripe eggs. The eggs are quite opaque and white in reflected light. 



The mature free-swimming male is yellowish gray and very slightly trans- 

 parent. In the head and in the posterior part of the abdomen are some small 

 rusty red globules. 



Copepods infesting echinoderms other than crinoids. 



Pionodesvwdes phormosoma Bonnier. From galls on the inside of the test 

 of Hygrosoma petersl (A. Agassiz). 



Echinockeres violaceus (Glaus). On Paraeentrotus lividus (Brandt). 



Echinoeheres minutus (Glaus). On Paracentrotus lividus (Brandt). 



Echivocheres glohosus Hansen. In swellings on the spines of Arcposoma 

 gracile (A. Agassiz) and Sperosorna quincunciale de Meijere. 



Cancerilla tuhulata Giard. On AmpMura sqimmata Sars. 



PJiilichthys amphiura' Herouard. On Amphiura squamata Sars. 



Chrodeumium obesum (Jungersen). On Asteronyx Joveni Miiller and 

 Troschel. 



Arthrochordeumium appendiculosum Stephensen. On Astrocharis gracilis 

 Mortensen. 



Astericola claVrSii Rosoll. On Marthasterias glacialis (O. F. Miiller). 



Linckiomolgus cceruleus Stebbing. On Linckia Icevigata (Linnaeus). 



