444 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



posterior end of the body terminates in a characteristic pygidium, with a 

 pair of thicker, longer filaments ventrally and 4 or 5 slenderer, shorter 

 filaments at the sides. 



Hooded hooks are disposed in single series of 8 to 15 where best 

 developed. Individually they are unique for their short, thick stalk and 

 compact beaked end and they have a broad, though short, hood. The 

 distal end terminates in a strong fang that is crowned by a single large 

 tooth over which there are 5 smaller teeth arranged in 2 rows of 2 each 

 and a smaller one at the outer edge. 



The tube is thin and consists of a mucoid membrane externally covered 

 with fine sand grains. It adheres closely to the body of the inhabitant 

 and is perhaps readily reconstructed when removed from the living 

 individual. 



A. gordiodes was originally, though with some doubt, assigned to the 

 genus Eunotomastus Mcintosh (Moore, 1909, p. 278). The status of 

 the genus Eunotomastus remains in doubt (see below) but since the 

 fragmentary description states that "the dorsal bristles are continued (in 

 four segments) after the commencement of hooks," it is clearly separable 

 from the species described above. The original and only known account 

 of A. gordiodes was based on a collection from San Diego, California. 

 Although there are some variations between it and the above account, the 

 differences may be due to interpretations rather than actual differences. 

 The prostomium was described as a minute blunt palpode with a pair of 

 nuchal organs. The presence of eyes was not mentioned but they might 

 have been faded. Eyes have been distinguished in all the individuals 

 examined but are darker in some individuals than in others. The thorax 

 was described with 17 setigerous segments and all were said to have both 

 notopodia and neuropodia. I have been unable to locate a neuropodium 

 on the first setigerous segment ; also, the eighteenth or also the nineteenth 

 segment has setae but in the last of these the neuropodium is uncinigerous, 

 partaking in its character of abdominal tori. Hooded hooks were first 

 shown with a thick shoulder terminatmg in a thick fang and 3 super- 

 imposed teeth surrounded by a short, inflated hood. I believe, however, 

 that the details, shown in plate 57, figs. 2 and 3, are not at variance with 

 those in the original account but merely amplify the known facts. 



Anotomastus gordiodes inhabits mud flats in low, intertidal zones. 



Distribution. — This has been taken in Mission and Newport Bays, 

 and Anaheim Slough in southern California ; another record. Bodega Bay, 

 central California is questionable. The only other known record is San 

 Diego, California (Moore, 1909). It is intertidal. 



