Boone, Mollusca, Cruises of "Eagle" and "Ara," 1921-28 205 



Technical description : See Rang 's original description, also Dob- 

 son 's additional notes and figures on the lingual ribbon and teeth. 



The "Ara" specimen is figured in plate 128. 

 References : Aplysia dactylomela Rang, Hist. Nat. des Aplysiens, p. 

 56, pi. IX, 1828, Paris.— Dobson, G. E., Jrn. Linn. Soc. Zool. 

 London, vol. XV, p. 159, text figures, 1, 2, 1881. — Heilprin, The 

 Bermuda Islands, p. 186, 1889. Tethys dactylomela Verrill, 

 Trans. Conn. Acad. Arts and Sci., vol. X, p. 545 ; ibid, vol. XI, p. 

 27, pi. Ill, fig. 3, 1901-03. 



Tethys depilans (Linne). 



Plate 129. 

 Name: Sea-Pigeon. 



Type: Not located. Linnaeus states : "Habitat in M. Mediterraneo. ' ' 



Distribution : This species is chiefly an inhabitant of the Adriatic 

 and Mediterranean Seas but is also known from the Atlantic coast of 

 Europe as far north as the south coast of Devon, England, and the 

 Channel Islands and southward on the west coast of France and 

 Madeira. Watson has recorded it from Simon's Bay, Cape of Good 

 Hope, Africa, 1873. 



Material examined : One large specimen, taken at Palermo, Italy, 

 September 2, 1924, by the "Ara." 



Color : The coloration of this sea-hare is quite variable, the ground 

 color being light brown, grayish brown, or, more rarely, very dark, 

 the markings always being irregularly shaped white or light gray 

 spots. 



Technical description: The living animal frequently attains a 

 length of 18 to 20 cm., but has the body distinctly more compressed 

 and shorter than its ally, T. leporina. The swimming lobes of T. 

 depilans are united posteriorly as far forward as the mantle siphon; 

 the foot is posteriorly rounded. The mantle has a broad round orifice 

 leading into the shell cavity and surrounded by dark brown rays. 

 The many glands which in life secrete a milky fluid open on the under 

 side of the mantle. The mantle siphon is shorter than that of T. 

 leporina. The genital and anal apertures are like those of leporina. 

 Behind the genital opening there are many one-celled glands, each 

 with its individual opening, thus differing from the grape-bunch like 

 gland of leporina. The anatomy of depilans has been worked out care- 

 fully by Vayssiere (1890), also by Blochmann (1884). The teeth and 



