Adinaria g 127 



often exsert, three-lobed conchula at one end, connected with a deep siphono- 

 glyph. The lateral lobes are swollen and each is terminated by two small 

 dark brown papillae. A median or terminal process is longest, often reaching 

 to the middle of the tentacles, or beyond, when expanded in life. 



The larger specimen, as studied in life, and not fully extended, was about 

 75 mm. (or 3 mches) long and 25 mm. in diameter; tentacles about 10 mm. 

 long; 3 mm. in diameter. The other specimen was about two thirds as large, 

 40 mm. long and 18 mm. in diameter. When first found they were consider- 

 ably longer. Taken August 26, 1870, buried in holes in gravel and sand, under 

 large stones, at low tide, a little south of Dog island, Eastport, Maine. This 

 was before the harbour became polluted by the offal from many sardine factories 

 built there in later years, which has now destroyed most of the rich fauna origin- 

 ally found there, even under the wharves, where the extreme tides were aljout 

 28 feet. 



This species was for many years thought by me to be possibly the adult 

 free stage of the parasitic Bicidium parasiticum, and the description was not 

 published for that reason, hoping that additional free specimens might be found. 

 This has not happened during nearly fifty years, so far as I know, until similar 

 specimens were found in Hudson bay by Mr. F. Johansen in 1920. (See 

 below.) 



Its general appearance is somewhat like the parasitic species, but the colour 

 is entirely different, and it is much larger. The most important external differ- 

 ence is in the conchula, which in this species is larger, much elongated, with two 

 papillae on the lateral lobes, and with the median process three-parted. In 

 the parasite, the three lobes are simple and the organ is much less developed. 



I have never made sections from these specimens and at present they are 

 not available for examination. They belong to the collections of the Yale 

 University Museum, now in storage. 



Bicidiopsis arctica. New species. 

 Plate XXV; Figs. 1-lk. Plate XXVI; Fig. 8. Text Fig. 16. 



Two specimens sent to me from the Geological Survey of Canada were 

 from the east side of Richmond gulf, in 15 to 20 fathoms, taken June, 1899, by 

 A. P. Low. Catalogue No. 54, (Coelenterates), Victoria Memorial Museum, 

 Ottawa. Type. I have made some sections from them, for anatomical details. 

 See Plate XXV; figs. 1-lk. 



As strongly contracted in alcohol they are soft, with many transverse 

 wrinkles, due to contraction. One is nearly spherical; the other is ovoid. 

 They are somewhat translucent, pale flesh-colour, and' the mesenteries show 

 through the integument. They have twelve stout, somewhat long, l)lunt, 

 equal tentacles, crowded in two alternate rows, They taper but little and are 

 strongly annulated with wrinkles (fig. Ic). Their walls are thick and muscular. 

 The mouth has at one end a prominent three-lobed "conchula," with a deep 

 sulcate siphonoglyph, tubular in part. (PI. XXV, fig. lb.) The conchula has 

 two large bilobed lateral lobes, each bearing two small nipple-shaped appen- 

 dages, the central lobe, as contracted, is smaller, less swollen, and bears a 

 small median papilla. In the larger Hudson bay specimen there is a firm 

 central muscular thickening at the aboral end, with no pore to be seen without 

 careful examination ; it is not larger than a small pinhole. In the other speci- 

 men there is a round terminal pore, nearly 2 mm. in diameter, with the ril)l)ed 

 ectoderm extending into it bv invection and forming a tube (fig Ik). It was 

 filled with a mass of partly digested food, etc., and the bottom lobes of the 

 stomodasum were nearly in contact with its inner lumen. 



