DESCRIPTION OF SPECIES. 
Order I. APODA. 
Body cylindrical or fusiform, devoid of pedicles and processes. Tentacles pinnate or 
digitate or peltate — digitate or simple unbranclied. 
Suborder T. APNEUMONA. 
Respiratory-trees absent. Ciliated cups, attaclied to the mesentery, present. No 
radial ambul acral vessels. 
Family Synaptid^. 
Genus Synapta, Eschscholtz;, 1829. 
Synapta beselii, Jaeger, 1833 (PI. I. fig. 12). 
Habitat . — Zebu Reefs ; several individuals. Amboina ; several specimens. Reefs 
at Papiete; numerous individuals. Station 177, August 18, 1874; lat. 16° 45' S., 
long. 168° 7' E.; depths, 130 fathoms ; a few specimens. 
All the specimens dredged at the different localities above mentioned seem to agree 
most certainly with those described by Jseger, Muller, Semper, &c. However, no one 
has, so far as I know, noted anything with regard to the peculiarity, that the very 
numerous Polian vesicles are, as it were, branched, that is, that four or five of them 
arise from the same base, and that some of these always appear to be more or less 
rudimentary. This arrangement of the Polian vesicles is very conspicuous in the 
individuals from Zebu Reefs. Amongst the specimens brought home from the reefs at 
Papiete there are several provided with two branched madreporic canals, of which, as 
is well known, the typical forms have but a single one. 
(ZOOL. CHALL. EXP. PART XXXIX. 1885 .) 
Qq2 
