THE ENTEROPNEUSTA. 633 
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Var. cooperi, nov. var. 
Very small form with short proboscis and collar, Proboscis cavity small 
and longitudinal muscles not gathered into distinct separate radial bundles. 
Branchial region rather more than 2x collar length. Lumen of collar cord 
with tendency to obliteration. Nuchal cornua very long, overlapping branchial 
region. : : . : 5 : : E : 5 : : : 00D 
Pt. viridis, n. sp. 
Medium sized form. Proboscis markedly longer than collar. Prevailing 
colour in life green. Proboscis cavity very small and longitudinal muscles not 
gathered into distinct separate bundles. Branchial region very short. Lumen 
of collar cord completely obliterated . ‘ 4 : 6 : ; . 5 ate 
Pt. asymmetrica, n. sp. 
Rather small form. Proboscis cavity small and longitudinal muscles not 
gathered into distinct separate radial bundles. Lumen of collar cord almost 
obliterated. Gonads asymmetrical, on left side only. ; . : c 2) 607 
Spengelia porosa, WILLEY, 1898 (Pl. XXXVIII. fig. 13; Pl. XLI. figs. 5, 7; Pl. XLII. 
fig. 11). 
Locauiry, Etc. This species was found in three localities, viz. : 
(a) Goifurfehendu Atoll, Goidu, where it was obtained from the sandy shore close 
to the east of the island in the sand below the weed and under some square slabs of 
beach sandstone in company with Pt. flava, var. muscula. (All this material was much 
macerated.) 
(b) S. Mahlos Atoll, Mamaduwari, where it was very common under the beach sand- 
stone masses to the north of the island. 
(c) Male Atoll, Hulule. A single specimen was obtained from a hole in a coral 
mass dredged from 7 fathoms in the lagoon of Hulule Atoll. (Anterior end only.) 
EXTERNAL FEATURES. In Willey’s specimen the proboscis was of a rich yellow colour, 
the collar bright orange and the body generally of a dull yellow colour. No observations 
on the colour of the Maldive specimens have reached me except of the single one from 
Hulule. Mr Stanley Gardiner noted that the colour here was uniformly pale lemon. Much 
stress however cannot be laid on the difference in colour from Willey’s specimen as this 
Hulule individual was represented only by the pre-genital part of the animal and was a 
rather small specimen. 
The general appearance of the Maldive forms agrees closely with the figure given by 
Willey ?99, Pl. XXVII. fig. 8). The size also is about the same though the length of 
the proboscis as compared with the collar is on the whole slightly greater than in Willey’s 
specimen. The relative length of the branchial region to the collar is on the average about 
6, as in Willey’s animal. In the single entire specimen in the collection the total length 
was 215mm. The branchial region is fairly constant in its length relative to the collar in 
individuals of different sizes. The number of gill slits increases markedly with the size of 
the animal. These facts are brought out in the following table of measurements :— 
