222 Mr. Salter on Palaeozoic Fossils from South Africa. 



Annelida. 



Two species only — one belonging to Serpulites and the other to Tentaculites — 

 have been yet observed. The latter is abundant ; and is in all probabiUty the 

 species referred to by Dr. Sandberger, who identifies it with the T. annulatus of 

 the Rhenish provinces. 



Tentaculites crotalinus, sp. nov. PI. XXV. figs. 15-18. 



T. uncialis, testa tenui, intus vix annulata, annulis externis rectis transversis, primum 

 crebris ; dein validis remotioribus, striis interstitialibus fere nullis ; apice laevi. 



Rather a small species ; three-quarters of an inch in length and about a line thick ; 

 slowly tapering and with nearly direct prominent rings, very variable in distance 

 from one another, but always more than their diameter apart in the older portions. 

 In the younger parts the rings are closer and less prominent, and the apex is fre- 

 quently bare of them for a variable space (fig. 16). At other times the young tube 

 is closely annulated nearly to the tip, but there is always some irregularity in the 

 rings there, and there are some intermediate striae (fig. 18). The latter are very 

 rare indeed among the older rings ; one or two are represented in fig. 16. 



Fig. 17 shows the internal cast; it has scarcely any trace of the rings which 

 are so conspicuous in T. annulatus of the Rhenish rocks*. That species too (and 

 its internal cast, T. scalaris of Schlotheim) is larger ; and its rings are a little 

 oblique, — a frequent character in the genus. 



There is a beautiful Tentaculite in the Devonian rocks of Armenia, which has 

 been shown to us by Prof. Abich, and which is a good deal like the T. crotalinus ; 

 but it hos a thick shell, and striae between the rings. 



Localities. — In a nodule of hard dark-grey rock, exhibiting ferruginous casts of 

 Tentaculites, Bellerophon, &c., from the Warm Bokkeveld. The Tentaculites also 

 occur in the light- coloured micaceous rock of the Hottentots Kloof, together with 

 Solenella rudis. 



Serpulites Sica, sp. nov. PL XXV. fig. 19. 



S. calcareus, unciam longus, compressus, lente curvatus, striis obliquis. 



There are not many available characters in the smooth shelly envelopes of 

 Annelids. The specimens before us, however, are a group of short tubes about 

 an inch long, compressed laterally, and curved like the sheath of an Indian dagger. 

 The striae of growth are conspicuous and oblique, retreating from the inner curve 

 of the tube. 



Locality. — In dark-coloured schist, Warm Bokkeveld. 



* The species termed "T. annulatus" in the " Silurian System," and indeed in all British works on 

 Silurian fossils, has longitudinal striae, and is clearly distinct. It should be called T. anglicus. 



