84 BULLETIN OF THE 



Tamoya punctata sp. nov. 



Figs. 4-6. 



A small Tamoya, different from any species of this genus which has yet been 

 described was found several times at the Bermudas. It is probably the young 

 of a species of the genus Tamoya, although it has differences from the known 

 species of the genus which may later, when more is known of the develop- 

 ment of Tamoya, call for its separation. The absence of enlargements of 

 the bases of the tentacles into " wings " separates it from the adult Tamoxja. 

 The youngest larva (fig. 4) has the following characters. In many respects it 

 resembles Proc/iara^ma Ilaeck., from which it however differs in the possession 

 of a well-marked " velarium '' and clusters of cells upon the external surface of 

 the bell. 



The bell of this larva has very rigid walls, as that of related TrachynemidfB. 

 The bell walls are colorless, and without radiating chymiferous tubes. The 

 height of the bell is a little more than its diameter. Its external surface bears 

 parallel circles of cells, each composed of several small clusters, and arranged 

 as shown in the figures. Instead of radial chymiferous tubes, we find four ra- 

 dial muscles, which extend along the inner bell walls from a j^oint just below 

 the apex of the bell to the marginal sense-bodies. 



The proboscis is at first a bag-like fold hanging downward in the bell cavity, 

 and slightly separated from its upper inner walls. It is a little more opaque 

 than the adjacent bell walls, and lias a reddi.sh or brownish color. There are 

 four short, stiff tentacles springing from the bell margin. Each is carried pro- 

 jecting outward, and is ribbed on its outer walls with rings of lasso-cells. The 

 tentacles have a reddish color at their extremities. 



The sense-bodies are four in number, and are set in deep incisions in the bell 

 margin, midway between the points of origin of tlie tentacles. Each sense-body 

 is covered externally by a well-developed ''hood" (/i), which is visible even 

 in the youngest specimens. A radial muscular band passes from the base of 

 each sense-body to the stomach, along the inner bell walls. A similar band 

 also makes its way directly from the point of origin of the style of the sense- 

 body into the "velarium." These last-mentioned muscles end blindly near 

 the inner rim of this structure. Each marginal sense-body has the form of a 

 spheroidal sac mounted on a short peduncle. This sac (otocyst) contains a 

 solid spherical body, which occupies most of the chamber of the otocyst op- 

 posite that into which the cavity of the style opens. The otolyth is nearly 

 transparent and colorless. There is a pair of ocelli situated in the lateral walls 

 on the sides of each otocyst. 



The " velarium " is thick, muscular, and propulsion is brought about by 

 its strokes on the water combined with movements of the bell walls. 



A second, somewhat older larva of T. punctata was also found. It differs 

 primarily from that just described in the greater length of the tentacles, and in 

 the modification in the shape of that part of the apex of the bell from which 

 the proboscis hangs. While the proboscis of the youngest Tamoya springs 



