0PHIU11ANS OF THE PHILIPPINE AND ADJACENT WATERS. 11 



1. Aspidophiura, including in all three species, A. minuta (Ly- 

 man), A. forbesi (Duncan) (=zglyptodisca H. L. Clark), and A. 

 watasei Matsumoto. 



2. Ophiurolepis, including only a single species, O. deshayesi (Ly- 

 man), which is a synonym of Ophiolejns carinata Studer. The lat- 

 ter name having priority, the species must henceforth be known as 

 Ophiurotepis carinata. 



3. Stegophiura, including about ten species, such as S. elevata 

 (Lyman), S. nodosa (Liitken), S. sladeni (Duncan) (=stiphra 

 II. L. Clark), S. sculpta (Duncan), S. sterea (H. L. Clark), etc. 



4. Amphiophiura, including about thirty species, such as A. bul- 

 lata (W. Thomson), A. convexa (Lyman), A. improba (Koehler), 

 A. insolita (Kcehler), A. latro (Kcehler), A, paupera (Koehler), A. 

 sordida (Kcehler), A. undata (Lyman), etc. 



5. Matsumoto left in the genus Ophkcra, as restricted by him, a 

 large number of species which he divided into two categories, one in- 

 cluding those with the arm comb formed of elongated, narrow, and 

 acuminate papillae, such as O. albida (Forbes), O ciliata (Retzius) 

 ( = texturata Lamarck), O. brevispina Smith, O. aequalis (Lyman), 

 O. carnea (Liitken), O. kinbcrgi (Lyman), 0, lepida (Lyman), O. 

 palliata (Lyman, 2 and O. sarsii (Liitken), the other including those 

 with the arm comb composed of low, short, and blunt papillae, such 

 as O. abyssorum (Lyman), 0. ambigua (Lyman), O. clemens 

 (Kcehler), O. confragosa (Lyman), O. inflata (Koehler), O. inornata 

 (Lyman), O. irrorata (Lyman), 0. nana (Liitken and Mortensen), 

 etc. 



There is a hiatus in the enumeration of the species given by Mat- 

 sumoto, for he makes no mention of a number of Antarctic forms, 

 such as O. brucei, O. flexibilis, O. frig^da, O. gelida, 0. mimaria, O. 

 partita, etc., which I have described within the past few years and 

 which evidently he was unable to place in any of the categories 

 established by him. Furthermore Matsumoto leaves in the genus 

 Ophiura as restricted certain species, such as O. abyssorum, O. con- 

 fragosa, and 0. inoimata, which obviously do not conform to the 

 characters of the restricted genus as he understands it. H. L. Clark 

 has created for these several species ('15, p. 235) the genus Homalo- 

 phiura, which is perfectly homogeneous and which includes about 

 20 forms. This genus is characterized by the reduction of the arm 

 comb, by having the brachial tentacular pores very slightly devel- 

 oped and not occurring beyond the first arm plates, by having the 

 buccal pores distant from the mouth, etc. 



3 Matsumoto gives O. papillata. This is evidently a typographical error, for he in 

 tended to write palliata. 



