NO. 1772. ANNELIDS OF THE ARENIC0LID.E—A8HW0RTH. 11 



tiite of the University of Vienna, for the opportunity of examining 

 which I am indebted to the kindness of Prof. Dr. K. Grobben. This 

 is a single specimen labeled, ^'A. piscatorum, Chile, No. 253," and 

 added in pencil are the words "var. carhonaria." The specimen is 

 not in a good state of preservation, its muscles are very relaxed, 

 and the tail region is broken into two pieces. Its total length is 

 300 mm., of which the tail, only a portion of which is present, re- 

 presents 50 mm. The external characters and internal organs of 

 this specimen agree absolutely with those of A. marina; it certainly 

 belongs to this species. There is unfortunately no information 

 available either as to the history or the exact place of capture 

 of this worm. If it be really from Chile, it is, so far as I am aware, 

 the only known specimen of Arenicola marina from the west coast of 

 America. 



Summary of the distribution of Arenicola marina on American 

 shores. — Arenicola marina has been recorded from a considerable 

 number of stations on the eastern coast of North America, from 

 Rigolet, Labrador, in the north to Noank, Connecticut, in the south. 

 Although there have been a few records of A. marina from the west 

 coast of North and South America, a re-examination of all the recorded 

 specimens still in existence has shown that they are examples of A. 

 claparedii. The only specimen of A. marina which I have seen from 

 the west coast of America is one in the Museum of the Zoological 

 Institute of Vienna, said to be from Chile, but no information regard- 

 ing the history of the specimen or the exact station where it was 

 captured is available. 



Further distribution of A. marinxi. — The shores of the White Sea, 

 Siberia, Norway, Sweden, Denmark, Germany, Holland, Belgium, 

 the British Isles, France, Portugal, the Mediterranean (a few stations 

 only, for instance, Trieste), the Faroe Islands, Iceland, Greenland, 

 the Marquesas and Kingsmill (Gilbert) Islands. 



ARENICOLA CLAPAREDII Levtasen. 



Nineteen chgetigerous segments; thirteen pairs of gills, the first, 

 which is on the seventh segment, may be small or absent; gills 

 usually of the pinnate type but may be bushy; lateral lobes of the 

 prostomium very large, much larger than the median lobe, and often 

 folded in their anterior portion (fig. 2) ; neuropodia clearly visible in 

 each segment, those of the posterior branchial region are wide antero- 

 posteriorly, forming cushion-like pads, but are not so long as those 

 of A. marina, so that neither the muscular ridge nor the groove 

 which contains the crotchets, approaches the mid-ventral line; five 



