REPORT THE HOLOTHHRIOIDEA. 
19 
1. Tentacles twenty -five. 
Synapta kefersteinii, Selenka, 1867 ; Semper, 1868. 
Tentacles with thirty to eighty digits. A broad cartilaginous ring present. ISTumerous 
Polian vesicles. A single madreporic canal. Anchor-arms smooth. Anchor- 
plates with six larger dentate holes, and three larger and some small smooth ones 
at the handle. IMiliary granules — small irregular rods or incomplete rosettes. 
Habitat. — Sandwich Islands (Sel.) and rSTavigators’ Islands (Semp.). 
Among the Holothurians preserved in the State Zoological Museum in Stockholm I 
have found the anterior portion of a Synapta obtained from Navigators’ Islands. It 
has twenty tentacles, two or three of which are slightly smaller, each furnished with 
as many as twenty-five digits on each side. The calcareous deposits, the numerous 
Polian vesicles, the cartilaginous ring, the single madreporic canal, &c., completely 
agree with those of Synapta hefersteinii. On account of the number of tentacles, 
I at first believed the animal in question to he a specimen of Synapta tenuis, but 
on closer examination it became apparent that it presented in many respects the 
most obvious resemblance to Synapta kefersteinii. So far as is known for the 
present, the number of tentacles is the only difference existing between the two 
sj)ecies just mentioned, but, as a matter of fact, several species of Synapta are 
capable of variation in this very respect. There seems to be but little doubt 
that Synapta kefersteinii and Synayota tenuis are identical forms. 
II. Tentacles twenty or twenty-one. 
Synapta tenuis (Fistularia), Qiioy and Gaimard, 1833; Selenka, 1867. 
Tentacles with fourteen to sixteen digits. Unsatisfactorily known. 
Habitat. — New Ireland (Quoy and Gaimard). 
HI. Tentacles fifteen. 
1 . Anchor -plates asymmetrical, elongate, .‘^ubrectangular, neai'ly tivice as long 
as broad, with numerous holes ivith smooth margins. Madreporic canal 
branched. 
Synapta beselii, Jaeger, 1833; J. Midler, 1850 and 1854; Held, 1857; Semper, 1868. 
Oncmolabes fuscescens, Brandt, 1835 (according to Ludwig 1881). Synapta 
astrolabi, Held, 1857. Synapta agassizii, Selenka, 1867. 
Tentacles with numerous digits. Cartilaginous ling with fifteen holes posteriorly. 
Numerous Polian vesicles. Madreporic canal single, dorsal, branched. When living, 
the animal is characterised by five longitudinal double rows of numerous large, 
round protuberances. Anchor-arms smooth. Eosette-shaped miliary granules 
present. 
