706 EEPORT OF COMMISSIONER OF FISH AND FISHERIES. 



tlie miscroscope, have the surface covered with projecting points. Sur- 

 jace of the crusts covered with small, irregular, scattered prominences, 

 in which the branchial orifices are situated. Cloacal orifices few and 

 distantly scattered. Systems irregular, the zooids scattered, but often 

 arranged in rather indistinct concentric groups around the cloacal open- 

 ings, and connected with them by cloacal ducts, which are variously 

 branched, often showing through the integument as dark dendritic lines, 

 converging toward the cloacal orifices from different directions. 



Color white, the zooids light yellowish. 



The colonies often become 200"^°* to aOOmm across; thickness seldom 

 more than 2.5""% commonly about 1.25 ™"^ ; zooids .5^"^" to .75"^'" long ; 

 diameter .25"°°^ to .SO'""^ 



Long Island Sound to Labrador. Thimble Islands, near l^ew Haven, 

 4to Gfathoms, rocky -, off' Stonington, 4 fathoms, rocky j common in Vine- 

 yard Sound, 8 to 15 fathoms ; abundant in Casco Bay, 6 to 40 fathoms ; 

 abundant in the Bay of Fuudy, low-water to 80 fathoms. Banks of 

 Newfoundland (T. M. Coffin). Mingan Islands, 10 fathoms (A. E. Y.). 

 Saint George's Bank (S. I. Smith). 



Leptoclinum luteolum Verrill. (p. 403.) 



Americau Jour. Science, loc. cit., p. 446, 1872. 



This species forms thin, coriaceous crusts, like the preceding, filled in 

 the same way with similar spherical corpuscles. The branchial orifices 

 open at the summits of low verrucae. The cloacal orifices are small, 

 with four to six lobes, and distantly scattered. Color deep salmon, or 

 somewhat rosy. 



The crusts are of all sizes up to 300™"" or more in diameter, and are 

 usually somewhat thicker than in the preceding species, with larger and 

 darker colored zooids. 



Connecticut to Bay of Fundy ; off Stonington, Connecticut, 4 fathoms, 

 rocky ; Vineyard Sound, 6 to 14 fathoms, common ; Casco Bay, 10 to 40 

 fathoms, common^ Bay of Fundy, low-water to 80 fathoms, common. 



T^NIOBRANCHIA. 

 Salpa Caboti Desor. Plate XXXIII, figs. 254, 255. (p. 445.) 



Proc. Boston Soc. Nat. History, vol. iii, p. 75, 1848 (not described) ; A. Agassiz, 

 op. cit., vol. xi, p. 17, figs. 1 to 5, 1866 ; Binney, in Gould, Invert., ed. ii, p. 6, 

 figs. 350 to 354, 1870 (description and figures copied from A. Agassiz). 



In the typical variety, as described by Mr. Agassiz, the color is pale 

 pink or rosy; the nucleus deep chestnut. Long Island Sound to Saint 

 George's Bank. Common in Buzzard's Bay and Vineyard Sound. Off 

 Saint George's Bank (S. I. Smith). 



Var. cyaned, (p. 446.) 



Nucleus and the borders of the mantle are bright Prussian-blue ; sur- 

 fiice of the latter delicately reticulated with fine blue lines. 



Vineyard Sound, especially off Gay Headly in September. 



