640 R. C. PUNNETT. 
deeply sunk position which it exhibited in the branchial region. Subgenital pits such as 
Willey found in Spengelia (99, p. 274) are absent. The gonads form a single row on 
either side of the body. Ripe spermatozoa occurred in the specimen from which the sketch 
of the genital region was taken. 
As belonging to the family Glandicipitidae there have already been described three 
genera, viz. Schizocardiwm, Glandiceps, and Spengelia. It cannot be said with any confidence 
that Willeyia bears a closer resemblance to any one of these genera than to another. 
Features which separate it from all these three are the shortness of the nuchal cornua, 
the comparatively small extent of the branchial portion of the csophagus as compared with 
the digestive, and possibly also the absence of gonads in the branchial region. With respect 
to other features of generic importance Willeyia resembles now one genus and now another. 
To which of the above genera it bears most resemblance with respect to the more salient 
features of its anatomy may be gathered from the appended table, p. 639. 
Balanoglossus carnosus, WILLEY, 1899 (Pl. XX XVII. fig. 3). 
Locauity, ETc, The greater portion of a very large specimen was obtained at Minikoi, 
at the base of a cylindrical casting in the sand flat lagoon. Fragments of the same species 
were also found at Hulule in sand under a large Porites mass close to the boulder zone. 
A coloured sketch was made of the Minikoi specimen by Mr Forster Cooper before 
preservation. This is reproduced on Pl. XXXVII. fig. 3, and shews the natural colours of 
the animal. A bright yellow line occurred mid-ventrally which was probably the nerve cord. 
The dimensions of this large specimen were taken by Mr Gardiner while it was yet 
alive. I have also taken them on the preserved specimen and the results of both are as 
follows :— 
Living Preserved 
Length of proboscis beyond collar... 9 mm. 3 mm. 
Breadth chit le RopOnGpaHORcooasoccaae IB} say — 
gerig thmoficollarensesssaeeteseseseec tere 22, Sie 
55 », branchial region ............ — 60); 
: », genital pleurae............... — 204 ,, 
. my Chovbootsll foJoys=nbets!6) Goopgppsqoos 440 ,, 355 
When alive and undamaged the animal probably exceeded 60 cm. in length, and possessed 
an average diameter of 10—12 mm. The above measurements agree fairly well with those 
given by Willey (99, p. 248). There appears to be considerable variation in the relative 
length of the branchial region which may be somewhat less than double the collar length, 
or may be as much as four times as much. The present specimen agrees with the largest 
of Willey’s specimens, which it rivals in size, in having a relatively long branchial region. 
In addition to the above fairly complete specimen a number of jelly tubes were found 
at the surface in castings similar to that which marked the position of the large worm. 
These tubes were much distended with sand, and of a transparent straw colour with bright 
yellow mid-dorsal and mid-ventral lines. The edge of the free (= anal?) end was marked 
by brown-black pigment. Doubtless these tubes are the broken off caudal ends of this 
species. Like Pt. flava (see p. 646) it may have developed the habit of autotomy. 
Balanoglossus parvulus, n. sp. (Pl. XX XVIII. figs. 15, 18, 22; Pl. XXXIX. fig. 24; 
Pl. XLI. figs. 1—4), 
Locality, ETc. Represented only by a fragment comprising the anterior end and including 
the proboscis, collar, branchial region, and a portion of the genital region, From Mahlos Atoll. 
