EUTIMALPHES SCINTILLANS. 167 



The collection contains a large series which, on account of the presence 

 of a peduncle, and the number of otocysts and tentacles, must be placed in 

 this genus ; they differ so much from the foregoing forms, both in the 

 extent of the gonads and in the absence of marginal knobs and cirri, as 

 to justify making them the basis for a new species. 



Eutimalphes scintillans, sp. nov. 

 Plate 5, Figs. 8, 9; Plate 37, Fig. 11. 



Acapulco Harbor ; surface ; many specimens. Type 10 mm. in diameter. 



The largest specimens are about 10 mm. in diameter by 5 mm. high. 

 The general form, with thin gelatinous substance and shallow bell cavity, as 

 seen in side view, is shown in the photograph (PI. 5, fig. 8). The peduncle 

 is short, only about 4 mm. in length in specimens 10 mm. in diameter, and 

 never, so far as I have observed, hangs below the opening of the bell. This 

 is considerably shorter than it is described by Romanes ('77) and Mayer 

 (: 00'') for U. indicans and E. coerulea. It is questionable, however, whether 

 this difference can be regarded as sufficiently constant to be of any spe- 

 cific value, inasmuch as Maas has shown that in Eirene the peduncle is 

 variable both in length and in outline. The manubrium is short and 

 nearly globular, the mouth surrounded by four short, simple lips. In this 

 character it, like the two species above mentioned, diflfers markedly from 

 E. pretiosa Haeckel. 



Tentacles. — The largest number of tentacles observed was thirty-six, of 

 which two were evidently of recent growth, being much smaller than the 

 others. Most of the large specimens have from twenty-nine to thirty-two 

 tentacles, usually with two or three of them in early stages of growth. 

 The smallest number counted was thirteen, in a specimen some 2.5 mm. in 

 diameter. There are no tentacular knobs on the margin, except such grow- 

 ing tentacles as are mentioned above, nor do the tentacles bear lateral cirri 

 at their bases, such as Mayer has figured (: 00*", pi. 11, fig. 22'") for E. coerulea. 

 The tentacles are short, and have swollen, conical bases. There are no 

 ocelli. 



Otocysts. — There are eight otocysts, as is typical of the genus, two per 

 quadrant (PI. 37, fig. 11). They are rather large, and contain each from 



