Mauclicstcr Memoirs, Yol. Ixi. (igi6\ No. I. 5 



few cases it appears as a small rounded swelling. In A. grandi- 

 ■flora and in my form when the polyp is contracted into the 

 calyx, one sees a small pit, and usually the surface is very 

 distinctly marked out into eight lappets or rays. The spicules 

 of the rind or cortex are of two types or sizes, as in A. grandi- 

 ■fiora. The larger spicules are straight or curved, and somewhat 

 irregularly spindle-shaped. They have a fairly large number 

 of projecting spines, the number of these spines appearing to 

 be larger in my specimens than in Aniltothcla grandiflora. 

 These spicules, however, appear as a rule to be larger than those 

 of Anthothela grandillora, thus many are i.i 10 or 1.8 mm. long, 

 and 0.276mm. broad, while those of A. grandtillora are only 

 about half this length, namely, 0.5 or 0.6 mm. 7\part from this 

 difference m size, these spicules resemble those of .4. grandiflora 

 very much in shape. As in .4. grandiflora, there is in the cortex 

 a number of spicules of a smaller and different type. These 

 are rods and clubs, which are much better provided with pro- 

 cesses than those of the last type; the latter spicules are also 

 larger than the corresponding ones in Anthothela grandiflora, 

 ranging from about o. i to 0.2 mm. The spicules of the calyx 

 are mostly of one type, namely, broad spindles with numerous 

 large and prominent processes. There are only a few of the 

 longer type of spicule, they are similar in shape to those figured 

 by Broch for .4. grandiflora. The first type varies considerably 

 in size from about 0.1380 x 0.368 to 0.644 x 0.276 mm. The 

 second type of spicule (which is rare) varies from about 0.644 x 

 0.276 to 1.840 X 0.276 mm. The spicules of the tentacles are 

 mostly long, thin spindles or rods, with few processes. These 

 tentacular spicules are fairly similar in form to those of A. 

 grandiflora, but apparently in some cases at least are much 

 longer. They vary in size from about 0.460 x 0.092 to 1.656 x 

 0.184 mm. The spicules of the medulla or central part of the 

 stem and branches are usually long, slender rods or spindles, 

 with few processes. They resemble those of the tentacles and 

 the long spicules of the cortex very much m form. They range 

 in size from about 0.462 x 0.0Q2 to 2.1 16 x 0.276 mm. It will 

 thus be noted that the spicules in my form tend to be larger 

 than those of A. grand ill or a; and further, the predominance of 

 one type of spicule m the calyx is noteworthy. While it is a 

 simple matter to distinguish my species from A. grandiflora, it 

 is not so easily compared with A. argcntea, Studer. It re- 

 sembles A. argentea in its arborescent form, slender branches 

 and slightly silvery spicules. It differs from .4. argentea m 

 the branches not arising at nearly right angles, in the tenta- 

 cular crown being retractile within the calyx, and in the polyps 

 being apparently less abundantly disposed than those of that 

 species, for Studer writes: — " Ics branches .... couvertes 

 de polypes qui sont poses sur la l)ase sous des angles droits." 

 From the briefness of the description and the absence of a 

 figure of Anthothela argentea, it is almost impossible to be 



