48 LAGIS. 



for the unfailing accuracy and beauty of the result, No careless work betokens haste or 

 weariness, but from the first translucent circle to the last the same uniform regularity 

 is maintained. Moreover, on magnifying a portion of the tube 1 the beauty and com- 

 plexity of the structure are more evident, for each of the fragments shows the central 

 tube of the spicule as a clear lumen or filled with extraneous granular matter. In 

 extremities a Nemertean (Anopla) will occasionally thrust itself into the mouth of the 

 tube, driving the annelid before it and compressing it in the narrow region behind. 

 In specimens from deep water, 80 — 130 fathoms in Hardanger Fjord and off Lervig 

 in Norway, the tubes, at first formed of fine sand-grains, were for some distance after- 

 wards made up of sponge-spicules placed transversely. 



The alimentary canal contains fine mud in which sponge-spicules, Foraminifera, 

 fragments of coccoliths, algae, and other structures abound. 



The preparation 65 . 3 . 9 . 7 in the British Museum labelled Pectinaria granulata, 

 from Shetland, is A. auricoma, and the same with 67 . 1 . 7 . 26 from Cornwall and 

 Berwick Bay. 



This form was the subject of an elaborate structural description by H. Rathke 3 (1842) 

 with excellent figures, and though he misinterpreted the segmental organs (which he 

 regarded as testes and ovaries) his account is worthy of all respect. 



As Claparede truly says, T)e Quatrefages did not profit by the distinctions Grrube had 

 made between Pectinaria belgica and this species, but attributed to Pectinaria belgica 

 certain of the characters of Amphictene auricoma. The Swiss author, however, was 

 doubtful about the contractile vascular caecum described in the northern species by 

 Rathke. The Neapolitan form showed no lateral cirri to the anal scoop, but it had 

 four tongue-like processes, and it had a triangular appendix posteriorly and a short cirrus 

 over the anus. 



A young stage of this species from Kiel Bay in June is alluded to by Willemoes- 

 Suhm, 3 but he gives no detailed description. 



Genus CXXXVL— Lagis, Malmgren, 1867. 



Smooth area behind the palmulae slightly excavated, with an entire rim. Semicircular 

 oral fold below the palmulae with cirri along the margin. Fifteen pairs of sub-equal bristle- 

 tufts along the sides. Bristles of two kinds — (1) strong bristles with tapered shafts, the 

 pale striated flattened tip bent at an angle and tapered to a slender extremity, and 

 (2) even stronger forms tapered toward the tip, which has rudimentary wings. Uncinigerous 

 lamellae commencing at the fourth segment, twelve in number. Pectiniform hooks with 

 the armed region set at right angles to the short shaft, and with six to seven teeth curved 

 downward. Caudal hooks with strongly curved tips and striated throughout. Tube 

 slightly curved neatly made of sand-particles. 



1 Vide ' Ann. Nat. Hist./ ser. 6, vol. xiii, p. 13, fig. 8. 



2 'Neuste Schriften Naturforsch. Gesellsch. in Danzig/ Bd. hi, pp. 56—83, Taf. v, exclus. 

 fig. 10, 1842. 



8 'Zeitschr. f. w. Zool./ Bd. xxi, p. 388, 1871. 



