PART 5 A MONOGRAPH OF THE EXISTING CRINOIDS 741 



Albatross station 4363; off San Diego, California; Point Loma Light House bearing 

 N. 81 E., 11.1 miles distant; 378-636 meters; temperature 6.00C.; green mud and 

 fine sand; March 15, 1904 (2, U.S.N.M., 35844). 



Albatross station 4341 ; off San Diego; south point of South Coronado Island bear- 

 ing N. 79 E., 3.3 miles distant; 343-590 meters; temperature 7.78 C.; gray sand with 

 black specks; March 11, 1904 (1, U.S.N.M., 35845). 



Albatross station 4383; off San Diego; north point of North Coronado Island 

 bearing S. 79 E., 2.3 miles distant; 525-722 meters; temperature 5.28 C.; green mud; 

 March 18, 1904 (1, U.S.N.M., 35846). 



Geographical range. Southwestern coast of North America, from Panama north- 

 ward to San Diego, California. 



Bathymetrical range. From 589 (?343) to 1967 meters. 



Thermal range From 2.83 C. to 7.78 C. 



Remarks. This species was originally described by Dr. Clemens Hartlaub in 1895 

 from a single much-broken individual dredged by the Albatross in 1788 meters near the 

 Cocos Islands in 1891. Hartlaub's description is rather general and he figures only a 

 single cirrus. 



As Antedon, sp., he recorded and figured at the same tune the centrodorsal and 

 arm bases of a comatulid from off Mariato Point, Panama, in 589 meters, which so far 

 as can be seen appears to be identical with the four small comatulids from off San Diego 

 mentioned below and which I refer to this species. 



In my rearrangement of the species of Antedonidae in 1908 I assigned parvula to 

 the genus Thaumatometra, being guided largely by Hartlaub's comparison between it 

 and Carpenter's Antedon alternata. In 1917 I found that it could have nothing to do 

 with alternata and placed it hi the genus Nepiometra. 



In 1923 Dr. H. L. Clark described a new species, which he called Trichometra euro- 

 pacifica, which had been dredged at Albatross station 5692, southwest of San Diego, 

 California. He wrote that he was inclined to list this comatulid as Thaumatometra 

 parvula in spite of the obviously different cirri, but the fact that I suggested to bun that 

 the arms were evidently the arms of a Trichometra, plus the combination of characters 

 shown by the cirri, pinnules, and arms, clearly indicated an undescribed species. 



At the tune we examined the small broken specimen together I knew parvula only 

 from Hartlaub's very insufficient description, and it was not until some tune later that 

 I discovered the specimens in the collection of the National Museum and learned how 

 much like a species of Trichometra it really is. 



Four small comatulids taken by the Albatross off San Diego together with num- 

 bers of Florometra serratissima appear to belong to this species. They are considerably 

 larger than Hartlaub's type and have more numerous cirrus segments, but they seem 

 to agree in the characters of the cirri and lower pinnules, in having P 4 shorter than 

 the preceding pinnules and in the rather unusual distal spacing of the syzygies, so 

 that there is little doubt that they are conspecific with the type. 



The description given was drawn up from the specimen from Albatross station 

 4383. 



[NOTES BY A.M.C.] Mr. Clark writes that he removed parvula from the genus 

 Thaumatometra after comparison (?with the description only) with T. alternata, but 

 it is T. tennis from northern Japan which is the type species and therefore the criterion 

 of Thaumatometra. Unfortunately, there are no specimens of either parvula or tenuis 



