236 



States. Though this species is distinctly different both from Lepto- 

 synapta tenuis and girardii, it was not regarded as a valid species 

 until Clark's excellent description of it in 1899. 



The specimens from Bermuda (those from Woods Hole are badly 

 preserved and nearly quite decalcified) are very interesting as they 

 may, by their size and colour, be separated into two different groups. 

 The specimens of the one group are rather small, measuring 

 no more than 3—5 cm in length. Their colour is as in the typical 

 specimens of the species distinctly reddish brown. The other spec- 

 imens are larger, up to 12 cm in length, and their colour is, though 

 they are from the same locality and preserved in the same jar, pure 

 white. The two groups are in the exterior so different that one may 

 suppose them to represent distinctly different species; this may be, 

 but as they are rather alike in the calcareous deposits, I prefer 

 for the present to regard the white specimens only as a variety 

 of roseola naming it alba n. var. 



As the white specimens are in the exterior very like Leptosyn- 

 apta tenuis, and may when not carefully examined be mistaken for 

 it, I suppose that the record of Leptosynapta inhaerens (— tenuis) 

 from Bermuda may be due to such a mistake. 



The description below of roseola is based upon the typical red 

 specimens, and as I do not find any distinct differences in the 

 calcareous deposits and the internal anatomy between the red and 

 the white specimens at hand, I do not tränk it necessary to give 

 a detailed description of the variety. 



There are usually twelve tentacles in this species, each with 

 seven digits, the terminal one being ca. three times as long as the 

 others. On the oral side of the tentacles there are 2 — 5 sensory 

 cups. Eye-spots are wanting. The radial pieces of the calcareous 

 ring (Fig. 40. 19) are not perforated for the nerves, but notched 

 in their anterior margin. The interradiais have a large triangular 

 projection on the exterior side. A cartilaginous ring is wanting. 

 There is one polian vesicle and a single unbranched stone-canal. 

 The intestine is straight and fastened by the dorsal and the left 

 ventral mesenteries. The oesophagus is rather short and the stomach 

 is not different from the intestine. The gonads are well developed 

 and have several long and thin branches. The genital duct opens 

 with a rather large papilla. This papilla is not placed on the body- 



