CALLIOP^A. 249 



^olis gymnota. 



Tlate XVI. Figs. 238-241. 



Animal small, tapering to a fine point, watery white ; tentacles short, the pos- 

 terior pair minutely serrated ; branchiae in seven lateral clusters of about live 

 each, slightly club-sliaped, having a reddisli-brown centre. 



Eolis (Tergipes, Cuv.) gymnota, Couthouy, Bost. Journ. Nat. Hist. ii. 69, pi. 1, fig. 3. 

 EoHdia gipnnota, De Kay, N. Y. Moll. 10, pi. 5, fig. 97 (184.3). 

 ^Eolis (jymnota, Sti.mpsox, Check Lists, 4 (1860). 



Body slender and tapering to a very fine point, of a pale, watery 

 drab color ; head small, rounded, with a distinct neck ; mouth 

 small ; dorsal tentacles short, linear, truncated, Avith very fine 

 wrinkles or serratures at the sides ; oral tentacles rather longer, 

 pointed. Foot transparent, as wide as the body, anterior angles 

 rounded. Branchioe short, slightly enlarged towards the tip, pale 

 straw color, very transparent, enclosing the reddish-brown or um- 

 ber-colored glandular body, which gives tlie general color to the 

 whole ; they are arranged in seven pairs of clusters of about five 

 each, along the lateral margins, leaving a large portion of the back 

 exposed, the second and third pairs rather longer than the others ; 

 the branchice are usually carried spreading outwards rather than 

 folded over the Ijack. Length, about an inch ; breadth, one tenth 

 of an inch. 



Found in Charles River, near Craigie's Bridge, Boston ; at 

 Warren Bridge, about the roots of Tubularia, October and 

 November, 1847 (^Couthony'). 



This species, which thus far seems to be rare, is nearly 

 allied to jE. concinna, Alder and Hancock. In that species 

 the branchiae are fusiform and white-tipped, and have a pe- 

 culiar satin lustre. The dorsal tentacles are longer than 

 the oral. It seems to 1>e a sluggish species. The ova are 2""fo5 

 deposited about the roots of Tubularia in vermiform masses ; ^'"""^""y- 

 four or five bunches are laid by an individual. They are laid in 

 November. 



Genus CALLIOP.EA, D'Orbigny. 18.37. 



Head without tentacles ; labial feelers very long and tapering. 

 Gills pyriform, placed in longitudinal lines. Front of foot an- 

 gular. 



