MoUusca.] SUBANTARCTIC ISLANDS OF NEW ZEALAND. 39 



stome sinipl(>, thin, sharp; outer lip angled; basal lip very lightly convex. Columella 

 short, arcuate ; inner lip retiexed above. Umbilicus quiti^ o])en. narrow, pervious. 



Diameter, 2-2 mm. ; height, 1-7 mm. 



Type in the Canterbury Museum, Christchurch. 



Hah. — Campbell Island, mostly on Drncophijlhdii ; apparently not common, or 

 perhaps easily overlooked (W. K. Chambers). 



Fam. ATHORACOPHDRTDAK. Fischer. 

 (;enus AthoRACOPHORUS. (lould. ISa-i. 



Dishihiition. — Both Islands of New Zealand, tlu' Snares, Auckland Islamls. 

 (\unpl)ell Island, and Mact^uarie Island. 



Athoracophorus (Pseudaneitea) huttoni, n. sp. (Plate I. figs. I7-I!t.) 



Animal (spirit specimen) rather small, back rounded, tail tapering to a rather 

 sharp point ; yellowish, with tour longitudinal rows of black spots on the notum, 

 the median part usually of darker colour, with numerous prominent papillae, the 

 head-shield with a median groove ; anal orifice near tlie perinotum. The ground- 

 colour is a light yellow, very likely amber when alive ; on the notum there are two 

 rows of dark-brown or blackish spots on each side from the median line, the inner 

 row of larger and often coalescing spots, the outer row formed by smaller and but 

 rarely confluent specks ; the broad median area between the two inner rows is 

 usually of a darker colour, but the mantle-area, the median groove in front, and 

 the papillae are of lighter colour ; there are in most specimens irregularly distributed 

 small black sjjots above and below the perinotum ; sole uniformly light yellow. 

 Head transversely oval, separated from the sole by a deep groove ; oral lobes very 

 distinct, oval, separated by a narrow flat ridge, and limited on the inner and outer 

 side by distinct frontal grooves. Tentacles retracted. Head-shield extending to 

 about half-way between head and mantle, with a median groove which is shallower 

 than the side grooves. The notum is thickly covered with very prominent round 

 papillae, arranged in longitudiiuil rows, 5 in a lateral field behind the mantle, but 

 gradually reduced from 4 to 2 in front of the mantle. The median groove extends 

 nearly the whole length of the back, bifiu'cating on approaching the tail-tip. Lateral 

 grooves narrow, slanting backwards, very seldom bifurcating towards the margin, 

 and extending, through contraction in alcohol, over hyponotum and sole ; there 

 are about 18 to 21 grooves on each side, 9 of which are postpallial. A distinct [ire- 

 anal groove is present. The mantle is distinctly triangidar, limited by grooves ; at 

 the anterior angle and in the median groove is the renal orifice, covered by a small 

 oval Hap ; the pulmonary orifice subcentral. The anal opening is on the right side, 

 below the mantle, but nearer to the perinotum. The hyponotuiii is very distinct, 

 2 mm. broad ; the perinotum is also well marked, nodulous, no doubt through con- 

 traction in alcohol. Sole aulacopod, again the result of contraction. 



The shell is rudimentary, consisting of about 20 sinall wldte calcareous grains 

 of various shapes and sizes, the largest having about 1 mm. major diameter. 



Measurements of largest specimen: Length over back from head to tip of tail, 

 2S mm. ; width of back to perinotum, Hi mm. Sole — Length, 25 mm. ; lireadth. 



