44 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
Remarks.—The small specimens are interesting in showing, in the 
horizontal interambulacral sutures, a distinct depression on each side 
of the primary tubercle; also the dark color of the sutures makes them 
very conspicuous on the whitish ground color of the test. They pro- 
duce a marked TVemnopleurus-like aspect. It should be pointed out 
that I have found the above-mentioned depressions also in other young 
specimens of this species. 
The specimen from station 5151 has the whole apical system 
deeply sunken, as if pressed in. It does not seem to be due to the 
effect of the presence of some parasitic organism. 
Parasite.—A. broken specimen of medium size from station 5482 is 
infested by three parasitic snails attached to the aboral side halfway 
to the apical system. They have produced the effect that the test has 
become abnormally constricted, the uppermost part forming like a 
top on the lower part. At the level of the parasites are found a num- 
ber of small brownish bodies loosely attached to the test. They seem 
to be egg masses of the snails, but the preservation is not good enough 
for ascertaining definitely their nature. The brown color appears to 
be due to the alcohol having been colored by crinoids. 
SALMACIS SPHAEROIDES (Linnaeus) 
Salmacis sphaeroides MortENSEN, The Danish Expedition to Siam 1899-1900, IT. 
Echinoidea [Danske Seisk. Skr., ser 7, vol. 1, No. 1], p. 70, pl. 5, fig. 23; 
pl. 6, figs. 1, 11, 41, 1904—H. L. Ciark, Catalogue of the recent sea- 
urchins in the British Museum, p. 87, 1925. 
Localities —Station 5165; Tawi Tawi group, Sulu (Jolo) Archi- 
pelago; Observation Island bearing N. 70° W., 6.4 miles distant (lat. 
4°58’20” N., long. 119°50’30” E.); 16 meters; coral; February 24, 
1909. One specimen. 
Catbalogan, Samar; littoral; April 15, 1908. One specimen. 
Remarks—The specimen from station 5165 is unusual in that the 
bases of most of the spines are not greenish, but reddish or purple, 
recalling S. bicolor, but in its other characters it is a typical sphaer- 
oides, so there can be no doubt that it is really sphaeroides. The 
test 1s nearly white, with merely an indication of a dark band of 
isolated spots at the ambitus. 
SALMACIS VIRGULATA L. Agassiz 
Salmacis virguiata typica DopERLEIN, Jenaische Denkschr., vol. 8, p. 712, pl. 
62, fig. 2. 1902.—MorTENSEN, the Danish Expedition to Siam 1899-1900, II. 
Echinoidea [Danske Selsk. Skr., ser. 7, vol. 1, No. 1], p. 68, pl. 6. figs. 7, 18, 
46, 47; pl. 7. fig. 40. 1904. 
Locality.—Station 5157; Tawi Tawi group, Jolo (Sulu) Arch- 
ipelago; Tinakta Island (N.) bearing S. 80° W., 3.3 miles distant 
(lat. 5°12’30’ N., long. 119°55’50’”" K.); 33 meters; fine sand and 
shells; February 21, 1908. One fine specimen of the form typica. 
