. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. SOME SOUTH AFRICAN AEOL1DACEAN NUDIBRANCHIA 141 denticles may or may not be present between the central and first lateral denticle and between the first and second lateral denticles. The distribution of secondary denticles is highly variable within and between radulae. The reproductive system (Fig. 17B) is similar to that described by Macnae (1954) but differs in three respects. There is no thin duct separating the penis from the penial gland; the penial stylet is slightly curved (Fig. 17C) and short
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. SOME SOUTH AFRICAN AEOL1DACEAN NUDIBRANCHIA 141 denticles may or may not be present between the central and first lateral denticle and between the first and second lateral denticles. The distribution of secondary denticles is highly variable within and between radulae. The reproductive system (Fig. 17B) is similar to that described by Macnae (1954) but differs in three respects. There is no thin duct separating the penis from the penial gland; the penial stylet is slightly curved (Fig. 17C) and shorter than the penis; the prostatic vas deferens does not taper markedly into a non-prostatic portion. Natural history Cuthona speciosa is found on and feeds upon calyptoblastic the genus Sertularella.* hydrozoans of. Fig. 18. Cuthona speciosa (Macnae, 1954). Scanning electron micro- graph of radula. Scale: 30 ^im between squares. Discussion Macnae (1954) described Catriona speciosa from two specimens from False Bay, South Africa. The presence of a non-tapering radula and the absence of a pre-radular tooth indicate that this species is more properly placed in Cuthona, comb. nov. The present material agrees closely with that described by Macnae, but differs in several respects and encompasses a wider range of variation. The number of ceratal rows in the anterior digestive branch ranges from 2 to 4 and an increasing number of rows is not correlated with body size. Macnae described only 3 rows. The specimens described in this study were larger and * Additional data received while in Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original South African Museum. Cape Town : The Museum
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
