REPORT ON THE GASTEKOPODA. 73 



The species seems to vary a good deal, especially in the sculpture of the umbilicus, the cord 

 surrounding which is sometimes very strong and yellow in colour, in other specimens is weak and 

 pale. 



Dr Fischer remarks that the extension of this species to the Philippines and Japan needs con- 

 firmation. Such confirmation is helped by the locality obtained for it by the Challenger, since 

 the presence of North-east Australian species in seas further north is a well-established fact ; whereas 

 the number of species common to the Asiatic sea-board and to South Australia is very small indeed, 

 though more of such cases are being recognised than was formerly admitted to be possible. 



38. Trochus (Sola? iclla) philippensis, Watson (PL VI. fig. 10). 



Trochus (Solariclla) philippensis, "Watson, Prelim. Report, pt. 5, Journ. Linn. Soc. Lond., vol. xv. p. 92. 



Station 161. April 1, 1874. Lat. 38° 22' 30" N., long. 144° 36' 30" E. Off the 

 entrance to Port Philip, Australia. 33 fathoms. Sand. 



Shell. — Eather like Trochus tumidus, Mont., but with a broader base, more conical, and 

 less scalar, with a large open umbilicus and brilliant colour. Sculpture: The shell is 

 gathered into small regular flat puckers below the suture ; these are weaker on the last 

 whorl. The whole surface is covered with very fine oblique longitudinal striae. Spirals : 

 There are very numerous fine, sharp, undulating scratches, which on the middle of the base 

 are shallower and wider apart, but toward the umbilicus again become sharper and more 

 crowded. Within the umbilicus are four or five somewhat beaded spirals, the first and 

 strongest of which forms an umbilical carina. Colour faintly iridescent all over, creamy 

 white, flecked with zigzag lines of crimson, which on the upper whorls are narrow and 

 regular, on the penultimate whorl are remote, and on the last are irregular, broken, and 

 crowded. On the base there are eleven to twelve elongated radiating crimson spots. 

 The first three whorls are a pale orange-yellow. Spire rather high, scalar. Apex small, 

 bluntly pointed. Whorls 6^, with a flat shelf below the suture, angulated at about 

 one-fifth of their breadth, and rounded from the angulation to the suture. The last whorl 

 is bluntly angulated at the edge of the rounded base. Suture strong, being slightly 

 impressed and very distinctly marked by the angle at which the adjoining whorls meet. 

 Mouth little oblique, round. Outer Up thin and sharp, not at all expanded. Inner lip 

 thin and sharp, a very little patulous on the pillar, where it also retreats a little, so as to 

 form a slight open sinus ; brilliantly iridescent within. Umbilicus wide and pervious, and 

 deeply impressed at the suture, which runs spirally up to the apex within. H. 0"275 in. 

 B. 0-33, least 0'3. Penultimate whorl, 0'085. Mouth, height 0-15, breadth 014. 



There is a Margarita tasmanica of Tenison Woods, from Bass Strait, which, from his description, 

 seems to present some features of resemblance to this species ; but he says of it that the upper part 



(ZOOL. CHALL. EXP. PART XLII. 1885.) Tt 10 



