. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CONTRIBUTIONS TO THE KNOWLEDGE OF MARINE MOLLUSGA 251 Grey or buff, with darker greenish-grey axial flames extending from suture to periphery, and often on to base. Jaws present, but thin and weak. Radula with c. 45-50 rows, lateral plates increasing slightly in size outwards, marginal plates hamate, cusps on all plates non-serrate. Natal (Krauss, Sowerby). Living: Durban (S. Afr. Mus. juv.); Delagoa Bay (S. Afr. Mus. coll. K. H. B., also ); Inhambane (); Mozam- bique Island (). Re
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. CONTRIBUTIONS TO THE KNOWLEDGE OF MARINE MOLLUSGA 251 Grey or buff, with darker greenish-grey axial flames extending from suture to periphery, and often on to base. Jaws present, but thin and weak. Radula with c. 45-50 rows, lateral plates increasing slightly in size outwards, marginal plates hamate, cusps on all plates non-serrate. Natal (Krauss, Sowerby). Living: Durban (S. Afr. Mus. juv.); Delagoa Bay (S. Afr. Mus. coll. K. H. B., also ); Inhambane (); Mozam- bique Island (). Remarks. It is probable that the specimens recorded as obscurus from a raised beach at Klein Brak River really belong to the following Fig. 13. Juveniles of Priotrochus obscurus (Wood) left, and P. alexandri Tomlin right; 3*5 X 4 mm. and 3-5 X 3-5 mm. respectively. Priotrochus alexandri Tomlin Fig. 13 (right) Priotrochus obscurus {non Wood) Smith in Rogers, 1906 b, p. 293. Priotrochus alexandri Tomlin, 1926 a, p. 295, pi. 16, fig. 8. Not quite so elevated in adult as obscurus, but altitude slightly greater than diameter, although in the Type the reverse is the case. Protoconch nucleus plus 5 whorls. Second and following whorls angularly shouldered; 2nd whorl with 2 spiral iirae, 3rd with 3, the middle lira forming a midwhorl shoulder, a thin intermediary lira between the middle and lower lirae which may or may not persist on to later whorls, middle lira with faint indications of nodules; on 4th and 5th whorls middle lira with 11—12 conspicu- ous nodules, complanate, but extending upwards towards the suture making the now inconspicuous 1st lira feebly nodulose; in apical view the 3rd lira is undulate, corresponding with the shoulder nodules. A 4th lira forms the periphery but is more or less absorbed in the suture, and does not become wholly visible until the last whorl; in apical view it also is slightly undulate. On base 7 (8) lirae well separated by concave sulci. R
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
