W. G. Van Name — Bermuda Ascidians. 365 



Var. hamiltoni, nov. 



Plate LII. Figures 43, 44 and 47. Plate LXI. Figure 1276. 



Plate LXII. Figure 135. 



In this the spicules are larger than in var. bermudense and they 

 have coarser and less numerous but often rather longer points, and 

 are more evenly distributed through the test, coming close to the 

 upper surface. From this it follows that the colony is stiffer, 

 harder and rougher than in the two last described forms. The 

 zooids are rather small (usually not much over l mm or L2 mm long) 

 and placed near together. Their apertures are rather prominent on 

 the surface. The colonies grow somewhat larger, but not very 

 much thicker (generally about 2 mm ) than those of var. pageti, into 

 which it grades, and with which it is found associated. The 

 colonies are very frequently decidedly yellow in color. It is a very 

 common variety. 



Var. harringtonense, nov. 



Plate LII. Figures 49 and 51. 



This forms rather extensive (often 30 or 40 mm wide) colonies of 

 moderate thickness (2 mm or over), white in color and resembling var. 

 bermudense, but having much larger (up to 0.05 mm ), longer pointed 

 spicules. (Fig. 49.) They are abundantly placed throughout the test 

 and make the colony hard and rough to the touch. 



The zooids are decidedly slenderer than in var. bermudense. 

 They apparently have about 10 stigmata in a row on each side, 

 short lobes to the branchial orifice, and but one testis. There are 16 

 tentacles or nearly that number. The vas deferens makes 8 or more 

 turns (fig. 51). 



Not common. 



Var. acutilobatum, nov. 



Plate LII. Figures 46 and 52. 



Resembles the last externally, but the colonies are rather thinner, 

 and I have not observed such large ones. The spicules are small 

 (0.025' nm in diameter), of remarkably uniform size and regularity of 

 form, with very few points, which are conical with bulging sides 

 (fig. 46). The zooids are small and short (fig. 52), about l mm long 

 in preservation, and are remarkable for the length and sharpness of 

 the lobes of the branchial orifice. The testis is divided into two 

 separate glands, each of which may be two-lobed. The vas deferens 

 makes seven or eight turns. 



Not common, but obtained both in 1898 and 1901. 



