94 UNITED STATES NATIONAL MUSEUM BULLETIN 296 



Cryptophialus coronatus Tomlinson, 1960a, page 404 



Figure 24 



Diagnosis: No mouth cirri; two pairs of large and one pair of 

 small toothed processes on operculum; lateral bar terminates on left 

 side in area studded with single-pointed teeth, on right side in tapered 

 point, both sides studded along ventral edges with teeth bearing one 

 to three points. 



Distribution: Haliotis tuberculata L. and Balanus tintinnahvlum 

 (L.). Haliotis at 6 meters depth off Goree Island, near Dakar; Balanus 

 washed ashore near airport at Dakar, Senegal; Thais {=Pourpres) 

 neritoides L (=T. nodosa L), West Africa, hundreds of specimens. 



Type-material: Holotype: Museum of Natural History, Paris, 

 1959-10. Paratypes and additional material at Institut Frangais 

 d'Afrique Noire, Dakar; Portobello MBS, New Zealand, and all 

 depositories on my list (see page 2). 



Young C. coronatus females early in their growth develop two pairs 

 of tapering, toothed projections bearing fine bristles. One of each 

 pair is on each side of the mantle aperture, and are of about equal 

 size. A third pair of these processes develops when the female is 

 about one-half grown in size, but remains somewhat smaller than the 

 first two pairs in the adult. This latter smallest pair is located ventrally 

 on the mantle aperture. A comb collar is present. The only coloration 

 on the preserved specimens was a reddish-purple band just beneath 

 the mantle aperture extending about one-half of the distance down the 

 neck. The teeth themselves are colorless, but the pigment extends 

 into the bases of the projections bearing the teeth, reinforcing the 

 "crown" appearance for which the species was named. 



A lateral bar extends along each side of the mantle from the aperture. 

 The bar is a thickened structure ending in a point and studded on 

 the ventral side by teeth bearing one to three points. The left lateral 

 bar ends in a large thickened area studded with six or more teeth. 



The cirri: The mouth cirri are entirely missing in this species. 

 One hundred sixty-seven carefully corroded, dissected, and whole- 

 mounted specimens were examined with no trace of mouth cirri. 



There are three pairs of biramous, multisegmented terminal cirri 

 in C. coronatus. The segmentation count is low, as follows: 



Terminal 



cirrus: 12 3 



Ramus: anterior posterior anterior posterior anterior posterior 



Segments: 11 16 18 19 21 21? 



The setation is typical of the genus. On the inner curvature of each 

 ramus of each cirrus two pairs of setae with very fine hairs arise, one 



