20 INVERTEBRATA OF MASSACHUSETTS. 



f. 5> DONOVAN ; Brit. Shells, pi. 7. WOOD ; Gen. Conch., pi. 11. CUVIER ; 



R&gne Anim., iii. 176. 

 Anatifa laevis, BRUG. ; Encyc. M6th., 166, f. 1. LAM. ; An. sans Vert., v. 



675. SCHUMACHER; Nouveau Syst., fyc., 97. 

 Anatifa vulgaris, GRAY ; Jlnnals of Philos., x. 1.00. 

 Pentelasrnis anatifera, LEACH ; Encyc. Brit., SuppL, iii. 170. SOWERBY ; Genera, 



f. 1, 2. 



Pentelepas Isevis, BLAINVILLE ; Malacol., pi. 84, f. 3. 

 Pollicipes laevis, GUE"RIN ; Iconog., Mollusques, pi. 37, f. 1. 

 Lepas anatifera, TURTON ; Conch. Diet., 71. 



Shell bluish-white, the lower valves triangular, rather obtuse at 

 summit, wrinkled by the lines of growth, and with very faint ra- 

 diating lines from the anterior basal angle ; upper valves triangular, 

 narrow, pointing downwards, tip blunted, and leaving quite a large 

 space occupied only by membrane ; very near the ,apex is a dis- 

 tinct angle at the back ; apex rounded ; back valve rather broad, 

 not much compressed, sometimes grooved lengthwise. Cartilage 

 of the living shell of an orange-color, as is also a portion of the 

 stalk adjoining the shell. Stalk of a light fawn-color. Cirri or 

 arms light flesh-color. Length of shell about 1 inch, of the stalk 

 from 1 to 6 inches. 



Found on the bottoms of vessels, and on drift wood. 



The orange ring at the base of the shell, and also the cartilages, 

 the light-colored cirri, the large space following the lower point of 

 the upper valves, the posterior angle of the upper valves being very 

 near the summit, and the broad back, are the peculiar marks of this 

 species. 



ANATIFA STRIATA. 



Valves with radiating strict ; posterior angle of upper valves 

 somewhat remote from apex ; back vake compressed ; animal dark 

 slate-color. 



State Coll., No. 249. Soc. Cab., No. 2084. 



Lepaa anserifera, LIN.; Syst., 1109. LISTER; Conch., pi. 440, f. 283. DONO- 

 VAN ; Brit. Shells, pi. 166, f. 2. WOOD ; Gen. Conch., pi. 10, f. 5. TURTON; 

 Conch. Diet., 72. GUALT. ; Test., t. 106, f. 2, 3. CHEMN. ; Conch., viii. t. 100, 

 f. 856. 



Anatifa striata, DRUG. ; Diet., No. 4, Encyc. Mtth., pi. 166, f. 2. LAM. ; An. sans 

 Vert., v. 676. 



Pentelasmis striata, LEACH ; Cirrhip. campyl. 



