THE APODOUS HOLOTHUBIANS 83 



REMARKS. This is undoubtedly the best-known member of the genus, as 

 it is very common at Bermuda and in Kingston Harbor, Jamaica, and owing 

 to its being viviparous, it has attracted an unusual amount of attention. In 

 addition to the characters already mentioned, the presence on the oral disc of 

 a pair of pigment-eyes at the base of each tentacle, and the opening of the 

 stone-canal to the outside of the body are notable features of the anatomy. 

 It is a somewhat gregarious Synaptid, numbers of individuals occurring to- 

 gether. They live in tufts and patches of seaweeds, where they creep about by 

 means of their tentacles, the anchors assisting in clinging to the plants. In 

 Bermuda they live chiefly in Ulvacete and are correspondingly green, while in 

 Jamaica they occur in Acanthophora (one of the Florideae) and are very de- 

 cidedly reddish brown; so that Bermudan and Jamaican specimens appear 

 very different at first sight. They are quite sensitive to changed conditions 

 and do not live well in aquaria. The food consists almost wholly of diatoms. 

 Breeding appears to go on throughout the entire year, for specimens taken in 

 April, May, June, July, September, and December all contained embryos and 

 young at various stages of development. The eggs develop in the body cavity 

 of the parent, and the young ultimately escape through rupture of the body- 

 wall near the anus; as many as 176 young have been taken from a single in- 

 dividual. For a full account of the development, anatomy, and habits of this 

 interesting species, see Clark ('98a). There can be no doubt that Lesueur's 

 ( '24) viridis was a green specimen of vivipara, with incompletely developed 

 tentacles, and his hydriformis a red individual of the same species. His de- 

 scription of the latter answers admirably to living examples from Jamaica, 

 while his description of the former is sufficiently near (save for its abnormal 

 tentacles) to specimens from Bermuda to leave no doubt in my mind that they 

 are the same. Nor can there be any question that Pourtales' ('51) Synapta 

 from Biscayne Bay, which he called viridis, is identical with Lesueur's and 

 Oersted's West Indian species. 



SYNAPTULA INDIVISA. 



Synapla indivisa Semper, 1868, p. 13. Calcareous particles, pi. iv^ fig. 1. 

 Chondroclosa indivisa Ostergren, 18986. 



LENGTH. 40 mm. 



COLOR. "Translucent reddish gray" (Semper). 



DISTRIBUTION. Reported from Zamboanga, Mindanao, Philippines (Sem- 

 per) ; Rotti, D. E. I. (Sluiter) ; and Thursday Island, Torres Strait (Sluiter). 

 Apparently confined to the East Indian region. 



REMARKS. Nothing has been added to our knowledge of this species since 

 Semper 's original description, and no one but Sluiter ('94, :01) has seen a 

 specimen. The undivided gonads, the extraordinarily long and slender tenta- 



