1896.] NEW YORK ACADEMY OF SCIENCES. 41 



the east coast of Amei'ica. The Enoplan species were the 

 more numerous. 



The Annelids embrace about fortj^ species, a rather numerous 

 list, and the crustaceans thirty. 



The collection from the region of Port Townsend is particu- 

 larly rich in its mollusca : ninety-three species of sixt3^-nine 

 genera are recorded. Among these are included the large 

 Gryptochiton stelleri, individuals of which when alive and ex- 

 panded were found to measure over 20 cm. Numerous smaller 

 species of Morpalia, Katherina, Tonicella occur in vast numbers 

 on rocks and piles between tides. Nudibranchs are abundant, 

 including man}^ of the more brilliantly colored : among the large 

 forms is a Dendronotus of over 25 cm. The collection of mol- 

 luscs includes some interesting cases of color variation (Cai'- 

 dium and Acmsea)^ color series {Littorina) and color harmoni- 

 zations. Among the last are various chitons and limpets 

 which mimic with great accuracy the rocks and weeds of their 

 station. Care was taken to procure a complete series of the 

 boring clam, Pholadidea jienita^ to show the gradual atrophy of 

 the foot and concrescence of the margin of the mantle as the 

 adult conditions were obtained. Specimens were also collected 

 ■of the related form, Zirphaea criapata^ in which the foot re- 

 mains functional throughout life. Of this form a series of ma- 

 turation and fertilization stages is also included in the 

 material. Among other mollusks Lepton was taken quite abun- 

 dantly on its host Gebia, whose first pair of abdominal appen- 

 dages it causes to atrophy : it is also interesting to note that 

 each valve of Le2yton develops a median furrow in adaptation to 

 the body form of the crustacean. A similar adaptation was also 

 recorded in a Placuanomia which was found attached to a Saxi- 

 domus: durinaf growth it had assumed accuratel}' the concentric 

 raised lines of the valve of its host. Unquestionabl}^ the most 

 important portion of the molluscan material — if not, indeed, of 

 the entire collection — is the rediscovery of Entoconcha^ the re- 

 markable parasitic Gasteropoda discovered by Johannes Miiller 

 in Synapta (1852), noted again by Baur (1864), and later briefly 

 recorded by Semper as occuring in Holothuria. The present 

 material was obtained by Mr. Harrington in the large Holothuria, 

 common in Puget Sound, and although specimens of Entoconcha 

 were not abundant, Mr. Harrington succeeded in collecting a 

 very valuable series of typical stages of its embryos and larvae. 



Insects were not found to be abundant. The material in- 

 cludes several interesting Coleopters. A Termes is noteworthy. 

 Among M3'riapods are Julus and Polydesmiis. 



The Ascidians are represented in the collection by about fif- 

 teen species, largely solitary forms. Two ThaliacciXi are included 



